WorksheetsForm 5 Chp 2 Electricity
Total questions: 103
Worksheet time: 2hrs 21mins
Name
Class
Date
1.
What does the current in the circuit depend on?
a)
The resistance
b)
The voltage
c)
Both, the resistance and the voltage
d)
Neither
2.
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
3.
The potential difference between the two ends of the wires is equal to the...
a)
resistance
b)
energy source current
c)
Potential difference between the two terminals of the battery
d)
the parallel end of the component
4.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator
c)
Resistance
d)
Conductor
5.
A material in which electrons are not able to move easily
a)
Circuit
b)
Insulator
c)
Resistance
d)
Conductor
6.
Electric current that flows in only one direction.
a)
Voltage
b)
Direct Current
c)
Alternating Current
d)
Series Circuit
7.
Electric current that reverses its direction of flow in a regular pattern
a)
Voltage
b)
Direct Current
c)
Alternating Current
d)
Parallel Circuit
8.
The flow/movement of electric charges
a)
Voltage
b)
Resistance
c)
Current
d)
Circuit
9.
This is related to the force that causes electric charges to flow
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit
10.
A closed path that electric current follows
a)
Voltage
b)
Current
c)
Resistance
d)
Circuit
11.
The current has only has one loop to flow through in this circuit.
a)
Series Circuit
b)
Parallel Circuit
12.
This circuit contains two or more branches for current to move through.
a)
Series Circuit
b)
Parallel Circuit
13.
A lamp changes __________ energy into light energy.
a)
Kinetic
b)
Electrical
c)
Sound
d)
Chemical
14.
Which of the two circuits would have the brightest bulbs?
a)
A
b)
B
15.
In which of these two circuits is the current the same at all points?
a)
A
b)
B
16.
If the voltage on V1 = 5V and voltage on V3 = 2V, what would be the voltage on V2?
a)
1V
b)
6V
c)
3V
d)
4V
17.
In a series circuit the current is the same at all points?
a)
True
b)
False
18.
In a parallel circuit the current is the same at all points.
a)
True
b)
False
19.
Resistance is higher in thick wires than thin wires.
a)
True
b)
False
20.
Copper is used as conducting wire.
a)
True
b)
False
21.
Which component does this statement describe.
"The metal breaks and stops current flowing, this stopping you being electrocuted."
"The metal breaks and stops current flowing, this stopping you being electrocuted."
a)
Bulb
b)
Fuse
c)
Motor
d)
Buzzer
22.
An example of an insulator is:
a)
iron
b)
silver
c)
copper wire
d)
rubber
23.
An electrical current produces a(n):
a)
magnetic field
b)
magnetic domains
c)
electrical resistance
d)
both b& c are correct
24.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
25.
Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?
a)
The balloons will repel each other.
b)
The balloons will attract each other.
c)
The balloons will become positively (+) charged.
d)
The balloons will pop.
26.
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.
27.
What is the unit of electrical power?
a)
watt
b)
volt
c)
ampere
d)
ohm
28.
The number of electrons flowing is called _____.
a)
voltage.
b)
power.
c)
current.
d)
resistance.
29.
One megawatt is equivalent to:
a)
102 W
b)
106 W
c)
1024 W
d)
108 W
30.
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.
31.
Potential difference between any two points is measured in:
a)
volts
b)
joules
c)
coulombs
d)
none of these
32.
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.
33.
The fuse wire should have a:
a)
low melting point.
b)
very high melting point.
c)
high melting point.
d)
none of these.
34.
When a short-circuit takes place, the fuse wire melts and breaks the __________.
a)
circuit
b)
electric shock
c)
Earth
d)
kilowatt-hour.
35.
The voltmeter is an instrument used to measure __________.
a)
potential difference
b)
kilowatt-hour
c)
overloading
d)
negative, positive
36.
Homes are wired in __________.
a)
series circuit
b)
parallel circuit
c)
kilowatt-hour
d)
negative, positive
37.
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
38.
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
39.
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
40.
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
41.
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
42.
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
43.
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
44.
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
45.
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.
46.
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
47.
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
48.
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
49.
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
50.
When another resistor is added to a parallel circuit, the total current...
a)
goes up.
b)
goes down.
c)
is unaffected.
51.
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.
52.
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
53.
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.
54.
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
55.
What is the unit of electric charge?
a)
Volts
b)
Amps
c)
Coulombs
d)
Ohms
56.
When a glass rod is rubbed with silk and the glass rod becomes positively charged, what happens to the electrons?
a)
They are removed from the rod.
b)
They are added to the rod.
57.
When does an attractive force occur between two charged objects?
a)
Like charges.
b)
Unlike charges.
58.
Where do electrons go when you rub a balloon on your hair?
a)
On the balloon.
b)
On your hair.
c)
Nowhere.
59.
Two objects with negative charges would:
a)
Attract
b)
Repel
c)
Do nothing.
60.
An object with a negative charge would _______ an object with a neutral charge.
a)
Attract
b)
Repel
c)
Do nothing
61.
An object with a positive charge would ______ an object with a neutral charge
a)
Attract
b)
Repel
c)
Do nothing.
62.
Two like charges:
a)
neutralize each other.
b)
repel each other.
c)
must be neutrons.
d)
attract each other.
63.
The charge of an electron is:
a)
Positive.
b)
Negative.
c)
Electrons have no charge
64.
Is this circuit closed?
a)
Yes
b)
No
65.
Is this circuit open or closed?
a)
Closed
b)
Open
66.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
67.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
68.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
69.
What would happen if you took one bulb out of a series circuit?
a)
The circuit would be closed
b)
It would not change the circuit
c)
You would create a short circuit
d)
None of the other bulbs would light
70.
Which will not allow electrical current to flow?
a)
a closed circuit
b)
an open current
c)
a series circuit
d)
a parallel circuit
71.
In a series circuit with 4 bulbs:
a)
a switch is never used
b)
all of the bulbs become dimmer if another bulb is added
c)
There are many paths for electricity to take
d)
the remaining 3 bulbs stay lit if one burns out
72.
According to Ohm's law, Resistance is equal to to voltage divided by:
a)
potential difference
b)
conduction
c)
time
d)
current
73.
An ampere is unit of
a)
temperature
b)
electric current
c)
length
d)
magnetic force
74.
When another resistor is added to a parallel circuit, the total current...
a)
goes up.
b)
goes down.
c)
is unaffected.
75.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will get brighter.
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
76.
An insulator is a material that...
a)
stops electrcity
b)
lets electricity flow
c)
protects you
d)
holds a wire
77.
A conductor is a material that...
a)
stops electrcity
b)
lets electricity flow
c)
protects you
d)
holds a wire
78.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
79.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
80.
Resistance is measured in ___.
a)
watts.
b)
amps.
c)
ohms.
81.
What is the formula for resistance?
a)
V x I = R
b)
R = V/I
82.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
83.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
84.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
85.
A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance
a)
58 Amps
b)
0.33 Amps
c)
13 Amps
d)
1 Amp
86.
If the two charges represented in the figure were brought near each other, they would
a)
attract each other.
b)
repel each other.
c)
cause static discharge.
d)
have no affect on each other
87.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
88.
this is the symbol for a _____?
a)
switch
b)
light
c)
battery
d)
wires
89.
a)
Bulb
b)
Battery
c)
Horn
d)
Fuse
90.
a pair of 15-watt computer speakers are connected to a 12-volt power supply. what is the electric current running through the speakers?
a)
1.25 A
b)
0.8 A
c)
12.5 A
d)
180 A
91.
A 9-volt battery drives an electric current through a circuit with 4-ohm resistance. What is the electric current running through the circuit?
a)
2.25 A
b)
0.44 A
c)
5.0 A
d)
36 A
92.
A flashlight bulb with a potential difference of 4.5 V across its filament has a power output of 8.0 W. How much current is in the bulb filament?
a)
3.7 A
b)
0.23 A
c)
1.8 A
d)
0.56 A
93.
What is the potential difference across a resistor that dissipates 5.00 W of power and has a current of 5.0 A?
a)
1.0 V
b)
4.00 V
c)
0.20 V
d)
125 V
94.
There is a potential difference of 12 V across a resistor with 0.25 A of current in it. The resistance of the resistor is
a)
48 Ω
b)
12 Ω
c)
24 Ω
d)
0.021 Ω
95.
A 13 Ω resistor has 0.050 A of current in it. What is the potential difference across the resistor?
a)
260 V
b)
0.65 V
c)
.004 V
d)
4 V
96.
A resistor has a resistance of 280 Ω. How much current is in the resistor if there is a potential difference of 120 V across the resistor?
a)
160 A
b)
0.12 A
c)
0.43 A
d)
2.3 A
97.
A set of electric trains are powered by a 9V battery. What is the resistance of the trains if they draw 3.0 A of current?
a)
27 Ω
b)
0.03 Ω
c)
2.7 Ω
d)
3 Ω
98.
Superconductors are metals that are perfect for conducting for electricity below certain temperatures
a)
False
b)
True
99.
A conducting sphere has a net charge of -4.8 x 10-17 C. What is the approximate number of excess electrons on the sphere?
a)
100
b)
200
c)
300
d)
400
100.
In the circuit shown above, what is the value of the current through the 4 ohm resistor?
a)
1 A
b)
1.33 A
c)
0.86 A
d)
0.46 A
101.
In the circuit shown above, what is the value of the potential difference (voltage) between points X and Y?
a)
1 V
b)
2 V
c)
3 V
d)
4 V
102.
A computer monitor runs on 120 V and has an internal resistance of 100 Ohms, what is the power dissipated through the monitor?
a)
1.2 W
b)
12 W
c)
120 W
d)
140 W
103.
A computer monitor runs on 120 V and has an internal resistance of 100 Ohms, what is the current running through the monitor?
a)
1.2 W
b)
12 W
c)
120 W
d)
140 W
100 %
