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WorksheetsElectrical Circuits
Total questions: 125
Worksheet time: 2hrs 8mins
Name
Class
Date
1.
Does this statement best describe a parallel or a series circuit.
Different voltages are dropped across each resistor.
Different voltages are dropped across each resistor.
a)
Parallel circuit
b)
Series circuit
2.
Does this statement best describe a parallel or a series circuit.
Different currents flow through each resistor.
Different currents flow through each resistor.
a)
Parallel circuit
b)
Series circuit
3.
Does this statement best describe a parallel or a series circuit.
If one part of the circuit fails, the other parts still work.
If one part of the circuit fails, the other parts still work.
a)
Parallel circuit
b)
Series circuit
4.
Does this statement best describe a parallel or a series circuit.
The total resistance is equal to the sum of the individual resistances.
The total resistance is equal to the sum of the individual resistances.
a)
Parallel circuit
b)
Series circuit
5.
The total resistance of a parallel circuit is always...
a)
greater than the sum of all the individual resistances.
b)
greater than any of the individual resistances.
c)
equalto the smallest of the individual resistances.
d)
less than any of the individual resistances.
6.
When another resistor is added to a parallel circuit, the total current...
a)
goes up.
b)
goes down.
c)
is unaffected.
7.
If a short occurs in one room of a house and it goes dark, but all the other rooms stay lit, it is because...
a)
all of the fuses have blown.
b)
the short has only blown one fuse and the rest of the house is still lit because it is in series.
c)
the short has only blown one fuse and the rest of the house is still lit because it is in parallel.
d)
the short has not blown any of the fuses.
8.
Circuit "S" has three 10 Ώ resistors in series with a 10 V battery. Circuit "P" has three 10 Ώ resistors in parallel with another 10 V battery. Which statement is NOT true?
a)
The total voltage of circuit "S" is greater than the total voltage of circuit "P."
b)
The total current in circuit "S" is less than the total current in circuit "P."
c)
The total resistance of circuit "S" is greater than the total resistance of circuit "P."
9.
An ammeter should have a very...
a)
low resistance, since it is hooked in series.
b)
low resistance, since it is hooked in parallel.
c)
high resistance, since it is hooked in series.
d)
high resistance, since it is hooked in parallel.
10.
A series circuit is composed of a 10.0 V battery and three resistors, which are 2.00 Ώ, 6.00 Ώ and 12.0 Ώ. How much current flows through the 12.0 Ώ resistor?
a)
0.500 A
b)
1.00 A
c)
1.00 V
d)
0.500 W
11.
A space heater has a current of 12.0 A flowing through it and an effective resistance of 9.00 Ώ.
A) Calculate the power of the heater.
B) How many kilowatt-hours of heat energy could this heater produce if it operated for an hour?
C) How many joules of energy is that?
D) If the electric company charges 6 cents per kWh, how much would it cost to run the heater for 8 hours?
A) Calculate the power of the heater.
B) How many kilowatt-hours of heat energy could this heater produce if it operated for an hour?
C) How many joules of energy is that?
D) If the electric company charges 6 cents per kWh, how much would it cost to run the heater for 8 hours?
a)
A) 1300W
B) 1.3o kWh
C) 4,670,000 J
D) 62.2 cents
B) 1.3o kWh
C) 4,670,000 J
D) 62.2 cents
b)
A) 1.3 W
B) 1300 A
C) 6,470,000 J
D) 26.6 cents
B) 1300 A
C) 6,470,000 J
D) 26.6 cents
c)
A) 0.500 A
B) 1.30 J
B) 1.30 J
d)
C) 4,670,000 kWh
D) 22.6 cents
D) 22.6 cents
12.
When the distance between two charges is halved, the electrical force between them...
a)
Quadruples
b)
Doubles
c)
Halves
d)
Reduces to one-fourth
13.
If you comb your hair and the comb becomes negatively charged...
a)
electrons were transferred from the comb onto your hair.
b)
electrons were transferred from your hair onto the comb.
c)
protons were transferred from the comb onto your hair.
d)
protons were transferred from your hair onto the comb.
14.
Which statement correctly describes how to charge something negatively by conduction?
a)
Touch it with a positively chareged object.
b)
Touch it with a negatively charged object.
c)
Momentarily grund it with a positively charged object nearby.
d)
Momentarily ground it with a negatively charged object nearby.
15.
If a neutral conductor is touched by a rubber rod with a negative charge on it, what will happen?
a)
Electrons will flow from the conductor onto the rubber rod.
b)
Electrons will flow from the rubber rod onto the conductor.
c)
Protons will flow from the conductor onto the rubber rod.
d)
Protons will flow from the rubber rod onto the conductor.
16.
Protons and electrons...
a)
repel each other.
b)
attract each other.
c)
have no effect on each other.
17.
Coulomb's law says that the force between any two charges depends...
a)
inversely on the product of the charges.
b)
directly on the square of the distance between the charges.
c)
directly on the product of the charges.
d)
inversely on the square root of the distance between the charges.
18.
In a good insulator, electrons are usually...
a)
free to move around.
b)
free to move around after an impurity has been added.
c)
semi-free to move around.
d)
tightly bound in place.
19.
A leaf electroscope is neutral. As a negative charge is brought close to the electroscope, the leaves spread apart because the approaching negative charge...
a)
attracts and pulls electron away from them.
b)
attracts and pulls protons away from them.
c)
pushes electrons down onto them.
d)
pushes protons down onto them.
20.
The reason a pith ball will be attracted to a charged rubber rod is that...
a)
the rod is positive and attracts electrons in the pith ball.
b)
the rod is negative and repels electrons in the pith ball, attracting the nearer protons.
c)
the rod is positive and repels electrons in the pith ball, attracting the nearer protons.
d)
the rod is negative and attracts electrons in the pith ball.
21.
A girl accidentally touches a partially plugged-in lamp plug one day. If the voltage from the wall outlet was 120 V and her skin's resistance was 120,000 Ώ, how much current passed through her body?
a)
12,000,000 A
b)
1,000 A
c)
120 A
d)
0.0010 A
22.
Circuit "S" has three users in series with a cell. Circuit "P" has the same circuit elements as circuit "S," but they are connected in parallel. Which statement is true?
a)
The total current in "P" is greater than the total current in "S."
b)
The total voltage of "P" is greater than the total voltage of "S."
c)
The total resistance of "P" is greater than the total resistance of "S."
23.
Which statement correctly describes a short circuit?
a)
Too many users are plugged into the circuit, lowering its total resistance, causing high currents.
b)
Too many users are plugged into the circuit, raising the total resistance, causing low current.
c)
Wires in the circuit become crossed, making it a series circuit and thus causing high currents.
d)
Wires in the circuit become crossed, making it "shorter" and thus causing high currents.
24.
When another user is activated in a parallel circuit...
a)
the total resistance rises.
b)
the total current falls.
c)
the total resistance falls.
d)
the total voltage increases.
25.
Which statement correctly describes an ammeter?
a)
It has high resistance because it hooks into a circuit in parallel.
b)
It has a high resistance because it hooks into a circuit in series.
c)
It has a low resistance because it hooks into a circuit in parallel.
d)
It has low resistance because it hooks into a circuit
26.
A 5.00 Ώ resistor, 10.0 Ώ resistor and a rheostat are connected in parallel and placed across a 12.0 V source. What amount of resistance should be set for the rheostat in order to draw a total current of 4.20 A from the source?
a)
2.0 Ώ
b)
20.0 A
c)
20.0 Ώ
d)
200 A
27.
One megawatt is equivalent to:
a)
102 W
b)
106 W
c)
1024 W
d)
108 W
28.
Electric current is the flow of:
a)
electrons
b)
protons
c)
neutrons
d)
none of these
29.
The color of a ground wire is generally:
a)
red
b)
blue
c)
black
d)
green
30.
Fuse wire is a:
a)
tin-lead alloy.
b)
tin-copper alloy.
c)
copper-lead alloy.
d)
silver-lead alloy.
31.
A person gets a severe electric shock on touching:
a)
a neutral wire.
b)
a live wire.
c)
a ground wire.
d)
none of these.
32.
A bulb of 100 W means that it will consume electrical energy at the rate of:
a)
100 kJ per second.
b)
100 kJ per hour.
c)
100 joules per second.
d)
100 joules per hour.
33.
Potential difference between any two points is measured in:
a)
volts
b)
joules
c)
coulombs
d)
none of these
34.
All wires used in electric circuits should be covered with:
a)
a colored material.
b)
a conducting material.
c)
an insulating material.
d)
none of these.
35.
The fuse wire should have a:
a)
low melting point.
b)
very high melting point.
c)
high melting point.
d)
none of these.
36.
When a short-circuit takes place, the fuse wire melts and breaks the __________.
a)
circuit
b)
electric shock
c)
Earth
d)
kilowatt-hour.
37.
If a person touches a live wire, he or she gets a severe:
a)
circuit
b)
electric shock
c)
overloading
d)
Earth
38.
The electric meters in our houses measure the electrical energy consumed in __________.
a)
circuit
b)
Earth
c)
kilowatt-hours
d)
3.6 x 106
39.
Charge will flow from one body to another body only when there is a _________ between them.
a)
circuit
b)
electric shock
c)
Earth
d)
difference in potential
40.
The __________ is considered to be at zero potential.
a)
circuit
b)
electric shock
c)
Earth
d)
kilowatt-hour
41.
One kilowatt-hour is equivalent to __________ joules.
a)
kilowatt-hour
b)
3.6 x 106
c)
red
d)
none of these
42.
A live wire is __________ in color.
a)
red
b)
blue
c)
green
d)
brown
43.
The overheating of electrical wiring in any circuit due to the flow of large current through it is called __________.
a)
circuit
b)
overloading
c)
Earth
d)
kilowatt-hour
44.
A flow of very large current due to direct contact of a live and neutral wire is called __________.
a)
overloading
b)
Earth
c)
short-circuit
d)
potential difference
45.
The flow of charge per unit time through a conductor is called __________.
a)
circuit
b)
kilowatt-hour
c)
overloading
d)
electric current
46.
The level of charge per unit time on a body is called __________ of the body.
a)
overloading
b)
potential difference
c)
leclanche
d)
Germanium
47.
The voltmeter is an instrument used to measure __________.
a)
potential difference
b)
kilowatt-hour
c)
overloading
d)
negative, positive
48.
The dry cell was invented by __________.
a)
Leclanche
b)
Einstein
c)
Lavoisier
d)
Hawkings
49.
Electricity moves only in a __________ circuit.
a)
circuit
b)
difference in potential
c)
closed
d)
open
50.
Homes are wired in __________.
a)
series circuit
b)
parallel circuit
c)
kilowatt-hour
d)
negative, positive
51.
When we turn the switch to the off position the circuit is __________.
a)
closed
b)
open
c)
negative, positive
d)
overload
52.
When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.
a)
parallel
b)
series
c)
open
d)
closed
53.
When you attach a wire to both terminals of a dry cell, the electrons flow from the __________ terminal to the __________ terminal.
a)
negative, positive
b)
positive, negative
c)
negative, neutral
d)
neutral, positive
54.
__________ and __________ are semi-conductors.
a)
Germanium, Silicon
b)
Iron, Cromium
c)
Tin, Carbon
d)
Nickel, Gallium
55.
The source of electric current for a hand-held transistor radio is __________.
a)
cell
b)
conductor
c)
material
d)
current
56.
Electricity used in homes is generated in __________.
a)
power plant
b)
dynamo
c)
cell
d)
conductor
57.
An electricity generating machine consists of a turbine and a __________.
a)
electric current
b)
conducting material
c)
conductor
d)
dynamo
58.
The substance which allows __________ to flow through it is called __________.
a)
electric current, conductor
b)
conductor, dynamo
c)
electric current, cell
d)
conducting material, electric current
59.
A closed circuit has its every part made of __________.
a)
electric current
b)
conducting material
c)
dynamo
d)
cell
60.
Fuses should be connected to the neutral wire.
a)
True
b)
False
61.
We should turn on the main switch if a person accidentally touches a live wire.
a)
True
b)
False
62.
We should switch off the main switch if a person accidentally touches a live wire.
a)
True
b)
False
63.
A large number of electrical appliances connected in a circuit can be operated together.
a)
True
b)
False
64.
A large number of electrical appliances connected in a circuit can not be operated together.
a)
True
b)
False
65.
Fuses should be connected to the live wire.
a)
True
b)
False
66.
We can get an electric shock if we touch a grounded appliance.
a)
True
b)
False
67.
We can get an electric shock if we touch a grounded appliance.
a)
True
b)
False
68.
Black wire is the ground wire.
a)
True
b)
False
69.
Green wire is the ground wire.
a)
True
b)
False
70.
There is no relationship between the SI unit and commercial unit of electrical energy.
a)
There is a relationship between the SI unit and commercial unit of electrical energy, i.e. 1 Kwh = 3.6 c 106 J.
b)
True
c)
Electric power is always measured in lumens.
d)
None of these answers are correct.
71.
Electrical work done by electric current is equal to electrical power consumed.
a)
Electrical work done by electric current is equal to electrical energy consumed.
b)
True.
c)
It depends on the number of rodents.
d)
None of these answer choices are correct.
72.
Pure water is a good conductor of electricity.
a)
True
b)
False
73.
When a circuit is closed the electric current does not flow through it.
a)
True
b)
False
74.
A bulb is the source of electricity in a flashlight.
a)
True.
b)
False.
75.
Glass is a good conductor.
a)
True
b)
False
76.
A bicycle works by electricity.
a)
True
b)
False
77.
Silk is a very good conductor.
a)
True
b)
False
78.
An electric iron should be grounded.
a)
An electric iron should be grounded because it protects the user from receiving a shock.
b)
An electric iron does not need to be grounded. It is not possible to be shocked by using one.
c)
None of these answers are correct.
d)
Irons are made of low conducting materials to prevent cosmic rays from interfering with the current.
79.
We should not be barefooted when we are repairing or replacing any electrical equipment.
a)
We should not be barefooted when we are repairing or replacing any electrical component. If there is any damage or cut in a wire, the current can leak through it and give a severe shock.
b)
False
c)
The luminescence inherent in the design of the oscillator prevents one from receiving a deleterious electrical shock in such circumstances.
d)
The internal design of the iron negates the possibility of a shock due to the effervescence of the internal energies.
80.
Tungsten metal is used to make the filament of some electric light bulbs because of its very high resistance and very high melting point.
a)
True
b)
False
81.
Inert gases like nitrogen and argon are used to fill electric light bulbs because these gases prevent the tungsten from melting or getting oxidized in air at high temperature.
a)
True
b)
False
82.
Current carrying wires must be insulated because it is dangerous to anyone to touch current carrying wires if they are not insulated.
a)
True
b)
False
83.
Fuse wires should be made of low melting point materials because when some overloading or voltage fluctuation takes place, the fuse wire melts. This in turn breaks the electric circuit, and hence current stops flowing in the circuit.
a)
True
b)
False
84.
Find the odd-one out:
Copper
Aluminium
Iron
Wood
Copper
Aluminium
Iron
Wood
a)
Copper
b)
Aluminium
c)
Iron
d)
Wood
85.
Find the odd-one out:
Plastic
Rubber
Glass
Silver
Plastic
Rubber
Glass
Silver
a)
Plastic
b)
Rubber
c)
Glass
d)
Silver
86.
Find the odd-one out:
Water heater
Electric coffee maker
Electric iron
Electric fuse
Water heater
Electric coffee maker
Electric iron
Electric fuse
a)
Water heater
b)
Electric coffee maker
c)
Electric iron
d)
Electric fuse
87.
Find the odd-one out:
Dry cell
Solar cell
Generator
Electric bulb
Dry cell
Solar cell
Generator
Electric bulb
a)
Dry cell
b)
Solar cell
c)
Generator
d)
Electric bulb
88.
Which circuit will light up?
a)
A, B
b)
B, C
c)
C, D
d)
D, F
89.
The human body is a good conductor of electricity. WHen a strong current flows through the body it produces violent muscular contractions and the person receives a shock. These shocks can damage body cells and can sometimes be fatal.
a)
True
b)
False
90.
The use of electricity is increasing daily in our society. Electricity is used in homes, offices, factories and even in agriculture such as electric pumps used to draw water from the ground to irrigate fields.
a)
True
b)
False
91.
In our homes, televisions, computers and refrigerators are common appliances and all of these appliances need electricity. So, we should contribute towards conserving electricity through simple actions like turning off lights and fans when not needed. Always use fluorescent bulbs instead of incandescent bulbs. These are some simple steps to conserve electricity.
a)
True
b)
False
92.
In non-commercial applications such as in homes, the ground wire is used for safety. One end of the ground wire is connected to the electrical appliance while the other end is connected to a large metal plate buried deep inside the ground. This is called grounding an appliance. Any current leaking into the appliance flows harmlessly to the Earth. Therefore, we do not get an electric shock if we touch a grounded appliance.
a)
True
b)
False
93.
What is the difference between potential difference and electric current?
a)
Electric current is the rate of flow of charge between two bodies at different potentials, while potential difference is the amount of work done by bringing a unit positive chagre from one point to the other. positive
b)
Both potential diffrence and electric current are the same thing.
c)
Potential difference is the rate of flow of charge between two bodies at different potentials, while electric current is the amount of work done by bringing a unit positive chagre from one point to the other
d)
None of these answers are correct.
94.
What is a difference between a dry cell and a storage cell?
a)
In dry cells the chemical reaction is irreversible whereas in storage cells the chemical reaction is reversible.
b)
In storage cells the chemical reaction is irreversible whereas in dry cells the chemical reaction is reversible.
c)
In dry cells the chemical reaction is reversible whereas in storage cells the chemical reaction is irrreversible.
d)
None of these answer choices are correct.
95.
What is the difference between direct current and alternating current?
a)
Direct current is the flow of electricity in only one direction, while alternating current reverses its direction at regular intervals of time.
b)
Alternating current is the flow of electricity in only one direction, while direct current reverses its direction at regular intervals of time.
c)
They are both the same thing, the only difference being the geographical area in which the term is being used.
d)
None of these answers are correct.
96.
What is the difference between conductors and insulators?
a)
Conductors are the substances which allow the current to flow through them with ease while insulators do not allow the current to flow through them with ease.
b)
Insulators are the substances which allow the current to flow through them with ease while conductors do not allow the current to flow through them with ease.
c)
Conductors and insulators are simply two forms of the same type of material, used to regualt ethe flow of electrons through capacitors.
d)
None of these answer choices are correct.
97.
What is the difference between series and parallel connections?
a)
In parallel circuits the current flows through two or more paths while in series circuits the current flows along a single path.
b)
In series circuits the current flows through two or more paths while in parallel circuits the current flows along a single path.
c)
The cohesiveness of parallel circuits dtermines their vicosity while in series circuits it is the inverse of their amplitude that determines their internal accuracy.
d)
None of these answer choices are correct.
98.
Three sources of electricity are:
a)
Electric generator, solar cells and dry cells.
b)
Solar cells, dry cells and gun powder.
c)
Electric generators, electric motors and flubber.
d)
None of these answer choices are correct.
99.
The relationship between electric current, electric power and potential difference is:
a)
Electric Current (I) = Electric Power (P) / Potential Difference (V)
b)
Electric Current (I) = Potential Difference (V)/Electric Power (P)
c)
Electric Power (P) = Electric Current (I)/ Potential Difference (V)
d)
Potential Difference (V) = Electric Current (I)/Electric Power (P)
100.
Three main effects of electric current include:
a)
Heating effect, magnetic effect and chemical effect.
b)
Heating effect, chemical effect and energy effect.
c)
Energy effect, magnetic effect and solar effect
d)
None of these answers are correct.
101.
Name four appliances based on the heating effect of electric current.
a)
Many devices like the electric iron, electric teapot, electric heater and the incandescent light bulb work on the basis of the heating effects of an electric current.
b)
Many devices like the electric iron, electric teapot, electric heater and the fluorescent light bulb work on the basis of the heating effects of an electric current.
c)
Many devices like the electric iron, electric teapot, electric heater and solar cells work on the basis of the heating effects of an electric current.
d)
None of these answer choices are correct.
102.
The electric fuse works on the heating effect of current. The electric fuse is connected to the live wires of a household circuit. If due to a fault in the household circuit like short-circuiting or overloading, a very large current flows in a household circuit. As a result, the fuse wire is heated and melts. This breaks the circuit and protects electrical appliances.
a)
True
b)
False
103.
A light bulb has 220 V, 100W written on it. What does this mean?
a)
If the bulb has the figures 220V and 100 W written on it, this bulb will use a voltage of 220 volts and will consume electrical energy at the rate of 100 joules per second.
b)
If the bulb has the figures 220 V and 100 W written on it, this bulb will use a wattage of 220 watts and will consume electrical energy at the rate of 220 joules per second.
c)
The figures written on the bulb onbly have significance if the buld is being used in Europe or Asia.
d)
None of these answer choices are correct.
104.
What are the three wires found in an electric circuit?
a)
All electrical circuits consist of three wires, a live wire which is red, a neutral wire which is black and a ground wire which is green.
b)
All electrical circuits consist of three wires, a live wire which is red, a neutral wire which is green and a ground wire which is black.
c)
All electrical circuits consist of three wires, a cold wire which is blue, a hot wire which is red and a ground wire which is black.
d)
None of these answer choices are correct.
105.
When we connect a number of appliances in a circuit they draw a large current. This causes electric wires to overheat, leading to short-circuiting and electrical fires. This phenomenon is called:
a)
Overloading
b)
Short-circuiting
c)
Electric shock
d)
None of these answers are correct.
106.
Sometimes due to damaged wiring, the live wire and neutral wire in a circuit touch each other. This causes the resistance of the circuit to be almost zero and a very large current flows through it. This sudden flow of a very large current due to sudden contact of a live and neutral wire is called:
a)
Overloading
b)
Short-circuiting
c)
Electric shock
d)
None of these answer choices are correct.
107.
If anyone touches a live electric wire, he or she gets a severe electric shock as our bodies are good conductors of electricity. This is called:
a)
Overloading
b)
Short-circuiting
c)
Electric shock
d)
None of these answer choices are correct.
108.
The path along which an electric current flows is called an electric circuit. There are two types:
a)
Open circuit,s and closed circuits
b)
Open circuits and neutral circuits
c)
Reserved circuits and wide circuits
d)
None of these answers are correct.
109.
There are two types of charges, they are:
a)
Positive charges and negative charges.
b)
Positive charges and depressed charges.
c)
Optomistic charges and negative charges
d)
Positive charges and morose charges.
110.
A glass rod is rubbed with silk. State the charge acquired by each.
a)
The glass rod becomes positively charged because it loses electrons while the silk becomes negatively charged because it gains an equal number of electrons.
b)
The glass rod becomes negatively charged because it loses electrons while the silk becomes positively charged because it gains an equal number of electrons.
c)
The glass rod becomes positively charged because it gains electrons while the silk becomes negatively charged because it loses an equal number of electrons.
d)
None of these answer choices are correct.
111.
The rate of flow of charge is equal to the electric current. In other words, the current is the amount of charge flowing in one second across the cross-section of a conductor, the cross-section being normal to its length or to the direction of flow of current. This can be written as:
a)
Current (I) = Charge (Q)/Time (t)
b)
Current (I) = Time (t)/Charge (Q)
c)
Charge (Q) = Current (I)/Time (t)
d)
Charge (Q) = Current (I)/Time (t)
112.
In a cell, which form of energy is converted into electrical energy?
a)
Chemical energy
b)
Solar energy
c)
Mechanical energy
d)
Electrical energy
113.
Why is electric wiring in homes connected in parallel circuits?
a)
Because if an appliance is removed, the circuits still remain closed so that other appliances continue to operate.
b)
Parallel circuits are used in homes because they are lit is a less expensive alternative to series circuits.
c)
It is advantageous to use parallel circuits in homes because these type of circuits cannot be overloaded.
d)
None of these answer choices are correct.
114.
A complete circuit is formed only when both terminals of a battery are connected to the bulb through conducting wires.
a)
True
b)
False
115.
Electric current is measured in amperes (A) by using an instrument called:
a)
Ammeter
b)
Ohmmeter
c)
Voltmeter
d)
Calorimeter
116.
A current of 4 A flows through a 12 V car headlight bulb for t10 minutes. How much electrical energy is consumed during this time?
Remember: W=VIt
Remember: W=VIt
a)
28800 J or 28.8 KJ
b)
600 s
c)
4.55 A
d)
120 V
117.
What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
Remember: I = P/V
Remember: I = P/V
a)
4.55 A
b)
28800 J or 28.8 KJ
c)
80 W
d)
200 W
118.
A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
Remember: I=P/V
Remember: I=P/V
a)
80 W
b)
200 W
c)
2.5 A
d)
4.55 A
119.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
Remember: V=IR and P=VI
Remember: V=IR and P=VI
a)
80 W
b)
200 W
c)
2.5 A
d)
22.5 KJ
120.
Calculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
Remember: I=V/R and P=VI
Remember: I=V/R and P=VI
a)
200 W
b)
80 W
c)
2.5 A
d)
79.20 KJ
121.
Calculate the electrical energy consumed when a potential difference of 5 V is applied across a resistor of 2 ohms for 30 minutes.
Remember: V=IR and I=V/R
Remember: V=IR and I=V/R
a)
80 W
b)
200 W
c)
22500 J or 22.5 KJ
d)
4500 J or 4.5 KJ
122.
A current of 0.5 A flows through a resistance of 10 ohms for half an hour. Find the amount of electrical energy consumed by the resistance.
Remember:
V = IR
P = VI
E = Pt
Remember:
V = IR
P = VI
E = Pt
a)
22500 J or 22.5 KJ
b)
4500 J or 4.5 KJ
c)
79.2 W
d)
2.5 A
123.
An electric meter reads 3462 kWh at the end of the month while a month ago it read 3396 kWh. How many units of electrical energy have been comsumed during the month? Find the cost of electrical energy consumed if 1 unit of energy costs $1.20.
a)
66 kWh = 66 units; $79.20
b)
45 kWh = 44 units; $52.80
c)
22.5 kWh = 22.5 units; $27.00
d)
80 kWh = 80 units; $96.00
124.
Does this statement best describe a parallel or a series circuit.
When more light bulbs are added they all remain bright.
When more light bulbs are added they all remain bright.
a)
Parallel circuit
b)
Series circuit
125.
Electrical work done per unit time is:
a)
electrical energy.
b)
electrical current.
c)
electrical power.
d)
electrical circuit.
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