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WorksheetsP5 P6 Electricity
Total questions: 50
Worksheet time: 1hrs 3mins
Name
Class
Date
1.
The accumulation of excess electric charge on an object is called
a)
Static electricity
b)
Electric discharge
c)
Resistance
d)
Circuit
2.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator
c)
Resistance
d)
Conductor
3.
A material in which electrons are not able to move easily
a)
Circuit
b)
Insulator
c)
Resistance
d)
Conductor
4.
The flow/movement of electric charges
a)
Voltage
b)
Resistance
c)
Current
d)
Circuit
5.
This is related to the force that causes electric charges to flow
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit
6.
A closed path that electric current follows
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit
7.
The tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy and light.
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit
8.
The current has only has one loop to flow through in this circuit.
a)
Series Circuit
b)
Parallel Circuit
9.
This circuit contains two or more branches for current to move through.
a)
Series Circuit
b)
Parallel Circuit
10.
The current in the circuit depends on ____ and ____.
a)
The anode and the cathode
b)
Narwhals and Unicorns
c)
Resistance and Voltage
d)
The battery and the lightbulb
11.
An example of a conductor is :
a)
a glass paperweight
b)
a plastic cap
c)
a metal screw
d)
a wooden handle
12.
An example of an insulator is:
a)
iron
b)
silver
c)
copper wire
d)
rubber
13.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
14.
The picture shows an electrical circuit. This circuit is a series circuit because:
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
15.
What is the unit of electrical power?
a)
watt
b)
volt
c)
ampere
d)
ohm
16.
The number of electrons flowing is called _____.
a)
voltage.
b)
power.
c)
current.
d)
resistance.
17.
One megawatt is equivalent to:
a)
102 W
b)
106 W
c)
1024 W
d)
108 W
18.
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.
19.
Potential difference between any two points is measured in:
a)
volts
b)
joules
c)
coulombs
d)
none of these
20.
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.
21.
The fuse wire should have a:
a)
low melting point.
b)
very high melting point.
c)
high melting point.
d)
none of these.
22.
When a short-circuit takes place, the fuse wire melts and breaks the __________.
a)
circuit
b)
electric shock
c)
Earth
d)
kilowatt-hour.
23.
If a person touches a live wire, he or she gets a severe:
a)
circuit
b)
electric shock
c)
overloading
d)
Earth
24.
The voltmeter is an instrument used to measure __________.
a)
potential difference
b)
kilowatt-hour
c)
overloading
d)
negative, positive
25.
Homes are wired in __________.
a)
series circuit
b)
parallel circuit
c)
kilowatt-hour
d)
negative, positive
26.
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
27.
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
28.
Electricity used in homes is generated in __________.
a)
power plant
b)
dynamo
c)
cell
d)
conductor
29.
Fuses should be connected to the neutral wire.
a)
True
b)
False
30.
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
31.
Find the odd-one out:
Copper
Aluminium
Iron
Wood
Copper
Aluminium
Iron
Wood
a)
Copper
b)
Aluminium
c)
Iron
d)
Wood
32.
Find the odd-one out:
Plastic
Rubber
Glass
Silver
Plastic
Rubber
Glass
Silver
a)
Plastic
b)
Rubber
c)
Glass
d)
Silver
33.
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
34.
Which circuit will light up?
a)
A, B
b)
B, C
c)
C, D
d)
D, F
35.
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
36.
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.
37.
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.
38.
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.
39.
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.
40.
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
41.
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
42.
Electric current is measured in amperes (A) by using an instrument called:
a)
Ammeter
b)
Ohmmeter
c)
Voltmeter
d)
Calorimeter
43.
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
44.
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
45.
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
a)
80 W
b)
200 W
c)
22500 J or 22.5 KJ
d)
4500 J or 4.5 KJ
46.
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
47.
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
48.
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
49.
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
50.
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.
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