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Worksheets

ELECTRICITY

Total questions: 158

Worksheet time: 2hrs 7mins

Name
Class
Date
1.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

2.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
3.
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
4.

If the current through a resistor is 2A and the voltage across it is 12V, what is the resistance

a)

12Ω

b)

6Ω

c)

24Ω

d)

0.167Ω

5.

If a circuit has two resistors in series both are 4Ω, what is the total resistance of the circuit?

a)

1Ω

b)

2Ω

c)

4Ω

d)

8Ω

6.

As the length of a wire increases, the resistance of the wire will

a)

increase

b)

decrease

c)

stay the same

7.

How do you calculate resistance?

a)

Current x Voltage

b)

Voltage x Power

c)

Voltage ÷ Current

d)

Current ÷ Voltage

8.

How do you calculate current from voltage and resistance?

a)

Current = voltage x resistance

b)

Current = resistance x power

c)

Current = voltage ÷ resistance

d)

Current = resistance ÷ voltage

9.

What is the resistance if the current is 2A and the voltage is 10V?

R = V / I

a)

8 Ω

b)

20 Ω

c)

12 Ω

d)

5 Ω

10.

How many Volts would it take to push 1 Amp through a resistance of 1 Ohm

V = I x R

a)

10 volts

b)

1 volt

c)

48 volts

d)

5 volts

11.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
12.

The resistance in a wire is 1.2kΩ. What is the resistance in  Ω?

a)

120 Ω

b)

12 Ω

c)

0.12 Ω

d)

1200 Ω

13.

The resistance in a wire is 2kΩ. What is the resistance in  Ω?

a)

20 Ω

b)

2 Ω

c)

0.2 Ω

d)

2000Ω

14.

The resistance in a wire is 0.5kΩ. What is the resistance in  Ω?

a)

50 Ω

b)

5 Ω

c)

0.5 Ω

d)

500Ω

15.

The resistance in a wire is 1000Ω. What is the resistance in  kΩ?

a)

10 kΩ

b)

1 kΩ

c)

0.1 kΩ

d)

1kΩ

16.

The resistance in a wire is 1MΩ. What is the resistance in  Ω?

(M = mega = 1,000,000)

a)

0.0000001 Ω

b)

1 Ω

c)

0.1 Ω

d)

1,000,000Ω

17.

The resistance in a wire is 3MΩ. What is the resistance in  Ω?

(M = mega = 1,000,000)

a)

0.0000003 Ω

b)

3 Ω

c)

0.3 Ω

d)

3,000,000Ω

18.

Can you guess for what the graph is plotted?

a)

Ohmic materials

b)

Non Ohmic materials.

19.

A student uses a length of wire as a resistor. He makes a second resistor from the same material.

To be certain of making a second resistor of higher resistance, he should use a piece of wire that is:

a)

longer and thicker.

b)

longer and thinner.

c)

shorter and thicker.

d)

shorter and thinner.

20.

The table describes four different resistance wires.


They are all made from the same metal.


Which wire has the smallest resistance?

a)

A

b)

B

c)

C

d)

D

21.

The diagrams show four current-voltage graphs.


Which two graphs show the characteristics of an ohmic resistor and of a filament lamp?

a)

ohmic resistor : W

filament lamp : Y

b)

ohmic resistor : X

filament lamp : Y

c)

ohmic resistor : W

filament lamp : Z

d)

ohmic resistor : X

filament lamp : Z

22.

Which two changes to a metal wire both increase resistance?

a)

decreasing its length and increasing its temperature

b)

increasing its length and decreasing its temperature

c)

decreasing its thickness and increasing its temperature

d)

increasing its thickness and decreasing its temperature

23.

16. Which of the following I-V graph represents ohmic conductors?

a)

(a) A

b)

(b) B

c)

(c) C

d)

(d) D

24.

Identify the component represented in this graph

a)

Ohmic conductor

b)

LDR

c)

Filament Bulb

d)

Fixed Resistor

25.

Identify the component represented by this graph:

a)

Diode

b)

Fixed Resistor

c)

Filament Bulb

d)

Cell

26.

Based on the graph above, the device is ohmic

a)

True

b)

False

27.

Based on the graph above, the device is ohmic

a)

True

b)

False

28.

Identical resistors in series will cause...

a)

the resistance to double

b)

the resistance to halve

c)

no affect on the resistance

29.

Identical resistors in parallel will cause...

a)

the resistance to double

b)

the resistance to halve

c)

no affect on the resistance

30.

What is the equivalent or total resistance (Re) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

31.
Which resistor will prevent the most current flow?
a)
1 ohm
b)
100 ohms
c)
1000 ohms
d)

0.5 kilo-ohms

32.

The total resistance in this circuit is 

a)
100 ohms
b)
450 ohms
c)
400 ohms
d)

9V

33.
As the resistance of a circuit increases, the current will
a)
increase
b)
decrease
c)
stay the same
34.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
35.

What effect does a hotter temperature have on resistance?

a)

No effect

b)

Increases resistance

c)

Decreases resistance

d)

Stays the same

36.

in which circuit is the lamp brightest

a)

1

b)

2

c)

3

d)

All the same

37.

in which circuit is the lamp brightest

a)

1

b)

2

c)

3

d)

All the same

38.

As the diameter of a wire increases, the resistance of the wire will

a)

increase

b)

decrease

c)

stay the same

39.

Which wire will have the least resistance?

a)

10 cm

b)

20 cm

c)

30 cm

d)

40 cm

40.

How do you calculate resistance?

a)

Divide voltage by current

b)

Divide charge by current

c)

Multiply current by voltage

d)

Multiply voltage and current

41.

Which resistor will let the most current flow?

a)
1 ohm
b)
100 ohms
c)
1000 ohms
d)

0.5 kilo-ohms

42.
Coal is a __________ energy resource.
a)
Renewable
b)
Nonrenewable
43.

What is the unit for energy?

a)

J

b)

j

c)

E

d)

e

e)

kg

44.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
45.

If a wire has 50 amps of current running through it, how many coulombs of charge would you expect to pass through it in 5 seconds?

a)

10

b)

45

c)

250

d)

0.1

46.

If 300 coulombs of charge pass through a wire in 10 seconds, what amperage would the current have?

a)

310

b)

3000

c)

0.03

d)

30

47.

If a wire has 28 amps of current running through it how many seconds would it take for 84 coulombs of charge to pass through it?

Q = I x t

(you must rearrange this equation)

a)

3

b)

56

c)

2352

d)

112

48.
What is the symbol for Current
a)
C
b)
Q
c)
I
d)
A
49.
What is the unit for Charge
a)
C
b)
Q
c)
I
d)
A
50.
What is a formula to calculate Charge
a)
Q=I*t
b)
Q=I/t
c)
Q = V*E
d)
Q = V/E
51.
What is a formula to calculate Current
a)
I=Q/t
b)
I=Q*t
c)
I =V*R
d)
I = R/V
52.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

53.

If the current through a resistor is 2A and the voltage across it is 12V, what is the resistance

a)

12Ω

b)

6Ω

c)

24Ω

d)

0.167Ω

54.

If a circuit has two resistors in series both are 4Ω, what is the total resistance of the circuit?

a)

1Ω

b)

2Ω

c)

4Ω

d)

8Ω

55.

How do you calculate resistance?

a)

Current x Voltage

b)

Voltage x Power

c)

Voltage ÷ Current

d)

Current ÷ Voltage

56.

What is the resistance if the current is 2A and the voltage is 10V?

R = V / I

a)

8 Ω

b)

20 Ω

c)

12 Ω

d)

5 Ω

57.

How many Volts would it take to push 1 Amp through a resistance of 1 Ohm

V = I x R

a)

10 volts

b)

1 volt

c)

48 volts

d)

5 volts

58.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
59.

What is the equation for power?

a)

Ep = m x h x g

b)

Ek= ½ x m x v2

c)

Ee = ½ x k x e2

d)

P = E / t

60.

Watts are a unit of .....

a)

power

b)

energy

c)

time

d)

mass

e)

extension

61.

Select the correct calculations: (2 marks)

P =

a)

I x V

b)

I / V

c)

V / I

d)

I2 x R

e)

R2 x I

62.

A hairdryer uses a current of 10A and has a voltage of 3V. How much power does it use?

a)

30W

b)

30w

c)

0.3 W

d)

3.3W

63.
A heating element resistance is 24 ohms. The current measures 10 Amps. What is the power?
a)
240 watts
b)
1,200 watts
c)
1,000 watts
d)
2,400 watts
64.

What is the electrical power when a voltage of 110 V drives a 5 A current through an electrical gadget?

a)

550 W

b)

22 W

c)

55 W

d)

220 W

65.

What is the current when a 600 W AC connected to a 120 V voltage?

P = I X V

a)

3 A

b)

4 A

c)

5 A

d)

6 A

66.

The current transferred by a circuit is 1A and there is a total resistance of 10 Ohms. What is the power rating for the circuit?

P = I2 X R

a)

10A

b)

10a

c)

10 V

d)

20A

67.

The current transferred by a circuit is 2A and there is a total resistance of 7 Ohms. What is the power rating for the circuit?

P = I2 X R

a)

28W

b)

28V

c)

28A

d)

14W

e)

14V

68.

A printer uses a current of 4.2A and has a voltage of 12V. How much power does it use?

Pick the right equation to use:

P = E/t

P = I x V

P = I2 x R

a)

50.4W

b)

0.35W

c)

211.68W

d)

2.86W

69.

The current transferred by a circuit is 0.23A and there is a total resistance of 105 Ohms. What is the power rating for the circuit?

Pick the right equation to use:

P = E/t

P = I x V

P = I2 x R

a)

5.6W

b)

24.2W

c)

2,536W

d)

2.86W

70.

What does the m stand for in the eqn to calculate gravitational potential energy: Ep = m x h x g

a)

mass (g)

b)

mass (kg)

c)

gravitational field strength (N/kg)

d)

height (m)

71.

What is the gravitational field strength on Earth?

a)

9.8N/kg

b)

98N/kg

c)

0.98N/kg

d)

9.8kg

72.

A student drops a piece of apparatus with a mass of 5kg from a height of 2m to the floor on Earth which has a gravitational field strength of 9.8N/kg. What is the change of GPE?

Ep = m x h x g

a)

10J

b)

9.8J

c)

98j

d)

98J

73.

A pupil walks slowly up a flight of stairs through a height of 4m carrying a rucksack of mass 5kg. Earth has a gravitational field strength of 9.8N/kg.What is the GPE gained by the rucksack?


Ep = m x h x g

a)

20J

b)

1.96J

c)

196j

d)

196J

74.

What is the equation for gravitational potential energy?

a)

Ep = m x h x g

b)

EK= ½ x m x v2

c)

Ee = ½ x k x e2

d)

P = E / t

75.

What is the equation for kinetic energy?

a)

Ep = m x h x g

b)

Ek= ½ x m x v2

c)

Ee = ½ x k x e2

d)

P = E / t

76.

Calculate the kinetic energy of an object of mass 2kg moving with a speed of 3m/s?


Ek = ½ x m x (v2)

a)

9j

b)

9J

c)

6J

d)

24J

77.

A spring has a spring constant, (k), of 3 N/m. It is stretched until it is extended by 0.50m. Calculate the elastic potential energy stored by the spring.


Ee= ½ x k x e2

a)

0.375j

b)

0.5625J

c)

0.375J

d)

0.75J

78.

What is the equation for elastic potential energy?

a)

Ep = m x h x g

b)

Ek= ½ x m x v2

c)

Ee = ½ x k x e2

d)

P = E / t

79.

Calculate the power of a device that transfers 500J of energy in 300s

P = E / t

a)

0.6J

b)

0.6W

c)

1.7J

d)

1.7W

80.

What is the unit for energy?

a)

J

b)

j

c)

E

d)

e

e)

kg

81.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
82.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
83.
This is the circuit symbol for ...
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
84.
This is the symbol for 
a)
Variable resistor
b)
Thermistor
c)
Resistor
d)
Fuse
85.
This is the symbol for a _____?
a)
Lamp
b)
Water wheel
c)
Loudspeaker
d)
Motor
86.
Which circuit diagram matches this picture of a circuit?
a)
A
b)
B
c)
C
d)
D
87.

What does an ammeter do?

a)

Measures the current flowing in a circuit.

b)

Measures the difference in electrical potential energy (potential difference) between 2 points

c)

Makes it harder for current to flow in a circuit.

d)

Converts electrical energy into light energy.

e)

Provides the circuit with electrical energy.

88.

What does an voltmeter do?

a)

Measures the current flowing in a circuit.

b)

Measures the difference in electrical potential energy (potential difference) between 2 points

c)

Makes it harder for current to flow in a circuit.

d)

Converts electrical energy into light energy.

e)

Provides the circuit with electrical energy.

89.

What does a resistor do?

a)

Measures the current flowing in a circuit.

b)

Measures the difference in electrical potential energy (potential difference) between 2 points

c)

Makes it harder for current to flow in a circuit.

d)

Converts electrical energy into light energy.

e)

Provides the circuit with electrical energy.

90.

What does a lamp do?

a)

Measures the current flowing in a circuit.

b)

Measures the difference in electrical potential energy (potential difference) between 2 points

c)

Makes it harder for current to flow in a circuit.

d)

Converts electrical energy into light energy.

e)

Provides the circuit with electrical energy.

91.

Batteries convert what type of energy into electricity?

a)

Chemical energy

b)

Nuclear energy

c)

Electrical energy

d)

Kinetic energy

e)

Light energy

92.

Which switch or switches must be closed to make only lamp B light up?

a)

Only switch a

b)

Switches a and b

c)

Switches a and c

d)

Switches a, b and c

e)

Switches b and c

93.

The diagram shows a circuit including a lamp, an electric bell and three switches S1, S2 and S3.


The bell is ringing but the lamp is not lit. Which switches are closed?

a)

S1 only

b)

S1 and S2 only

c)

S1 and S3 only

d)

S1, S2 and S3

e)

S2 and S3 only

94.

Which statements are incorrect about an ammeter? (2 marks)

a)

It measures in Amps

b)

It is placed in parallel to the component

c)

It measures the flow of current

d)

It is placed in series to the components

e)

It measures in Volts

95.

Which statements are incorrect about an voltmeter? (2 marks)

a)

It measures in Amps

b)

It is placed in parallel to the component

c)

A device for measuring potential difference across a component

d)

It is placed in series to the components

e)

It measures in Volts

96.

What is the function of a battery?

a)

Measures the difference in electrical potential energy (potential difference) between 2 points.

b)

Converts electrical energy into light energy.

c)

Makes it harder for current to flow in a circuit.

d)

Converts electrical energy into kinetic energy.

e)

Converts chemical energy into electrical energy

97.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
98.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
99.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
100.

What is the current on the other ammeter?

a)

0.15A

b)

0.15a

c)

0.3A

d)

0.3a

e)

0.075A

101.

This is a series circuit. What value will be shown on the other ammeter?

a)

0.3A

b)

0.3a

c)

0.15A

d)

0.6A

e)

0.6a

102.

What is the current?

a)

0.3A

b)

0.15A

c)

0.6A

d)

0.15a

e)

0.3a

103.

What is the voltage of the 2 cells?

a)

3V

b)

1.5V

c)

6V

d)

3v

e)

1.5v

104.

What is the potential difference over the second bulb?

a)

4.5V

b)

9V

c)

1V

d)

3V

e)

0V

105.

The cell provides a voltage of 1.5V to this parallel circuit. If the bulbs both have the same resistance, what will be correct voltage for each of the bulbs? (2 marks)

a)

middle bulb = 1.5V

b)

middle bulb = 3V

c)

bottom bulb = 3V

d)

bottom bulb = 1.5V

e)

both bulbs have a voltage of 0.75V

106.

What is the voltage shown on V1?

a)

3V

b)

1.5V

c)

6V

d)

0.75V

e)

1V

107.

What is the voltage shown on V2?

a)

3V

b)

1.5V

c)

6V

d)

0.75V

e)

1V

108.

What is the current shown on A1?

a)

0.2V

b)

0.2A

c)

0.4A

d)

0.1A

e)

3V

109.

What is the current shown on A2?

a)

0.2V

b)

0.2A

c)

0.4A

d)

0.1A

e)

3V

110.
Voltage is measured in __.
a)
volts.
b)
watts.
c)
coulombs. 
111.

If a wire has 50 amps of current running through it, how many coulombs of charge would you expect to pass through it in 5 seconds?

a)

10

b)

45

c)

250

d)

0.1

112.

If 300 coulombs of charge pass through a wire in 10 seconds, what amperage would the current have?

a)

310

b)

3000

c)

0.03

d)

30

113.

If a wire has 28 amps of current running through it how many seconds would it take for 84 coulombs of charge to pass through it?

Q = I x t

(you must rearrange this equation)

a)

3

b)

56

c)

2352

d)

112

114.

Is there are 44 amps of current, and it runs through a wire for 11 seconds, how many coulombs of charge will pass through the wire?

Q = I x t

a)

4

b)

0.24

c)

484

d)

33

115.
Current is measured in what unit?
a)
ohms
b)
volts
c)
watts
d)
amps
116.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
117.
The flow/movement of electric charges 
a)
Voltage
b)
Resistance 
c)
Current 
d)
Circuit 
118.

A current of 0.5 A flows in a circuit. Calculate the charge flowing through the circuit in one minute.

a)

0.5 C

b)

30 C

c)

120 C

119.
What is the symbol for Current
a)
C
b)
Q
c)
I
d)
A
120.
What is the unit for Charge
a)
C
b)
Q
c)
I
d)
A
121.
What is the symbol for Charge
a)
C
b)
Q
c)
I
d)
A
122.
What is a formula to calculate Charge
a)
Q=I*t
b)
Q=I/t
c)
Q = V*E
d)
Q = V/E
123.
What is a formula to calculate Current
a)
I=Q/t
b)
I=Q*t
c)
I =V*R
d)
I = R/V
124.
How much charge must pass by a point in 10 s for the current to be  0.50 A? 
a)
0,05C
b)
5,0C
c)
20C
d)
2,0C
125.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

126.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
127.
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
128.

If the current through a resistor is 2A and the voltage across it is 12V, what is the resistance

a)

12Ω

b)

6Ω

c)

24Ω

d)

0.167Ω

129.

If a circuit has two resistors in series both are 4Ω, what is the total resistance of the circuit?

a)

1Ω

b)

2Ω

c)

4Ω

d)

8Ω

130.

As the length of a wire increases, the resistance of the wire will

a)

increase

b)

decrease

c)

stay the same

131.

How do you calculate resistance?

a)

Current x Voltage

b)

Voltage x Power

c)

Voltage ÷ Current

d)

Current ÷ Voltage

132.

How do you calculate current from voltage and resistance?

a)

Current = voltage x resistance

b)

Current = resistance x power

c)

Current = voltage ÷ resistance

d)

Current = resistance ÷ voltage

133.

What is the resistance if the current is 2A and the voltage is 10V?

R = V / I

a)

8 Ω

b)

20 Ω

c)

12 Ω

d)

5 Ω

134.
Current has units: 
a)
kilowatt·hour 
b)
ampere 
c)
coulomb 
d)
volt 
135.

How many Volts would it take to push 1 Amp through a resistance of 1 Ohm

V = I x R

a)

10 volts

b)

1 volt

c)

48 volts

d)

5 volts

136.
If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?
a)
5 V
b)
12 V
c)
0.2 V
d)
20 V
137.

The current in a wire is 1.2kA. What is the current in Amps?

a)

120A

b)

12A

c)

0.12A

d)

1200A

138.

What is the equation for power?

a)

Ep = m x h x g

b)

Ek= ½ x m x v2

c)

Ee = ½ x k x e2

d)

P = E / t

139.

P = E / t.

What is does the symbol t mean?

a)

power

b)

energy

c)

temperature

d)

time

140.

Watts are a unit of .....

a)

power

b)

energy

c)

time

d)

mass

e)

extension

141.

Calculate the power of a device that transfers 500J of energy in 300s

P = E / t

a)

0.6J

b)

0.6W

c)

1.7J

d)

1.7W

142.

Calculate the power of a device that transfers 1790J of energy in 226s

P = E / t

a)

0.13J

b)

0.13W

c)

7.9J

d)

7.9W

143.

Calculate the energy transferred in a device that is turned on for 60s that has a power rating of 100W

P = E / t

a)

1.7J

b)

0.6J

c)

6000W

d)

6000J

144.

Select the correct calculations: (2 marks)

P =

a)

I x V

b)

I / V

c)

V / I

d)

I2 x R

e)

R2 x I

145.

A hairdryer uses a current of 10A and has a voltage of 3V. How much power does it use?

a)

30W

b)

30w

c)

0.3 W

d)

3.3W

146.
What is 80% of 2400 watts?
a)
1920 watts
b)
19,200 watts
c)
2000 watts
d)
20,000 watts
147.
A heating element resistance is 24 ohms. The current measures 10 Amps. What is the power?
a)
240 watts
b)
1,200 watts
c)
1,000 watts
d)
2,400 watts
148.

The unit of electrical current is

a)

Watt (W)

b)

Volt (V)

c)

Ampere (A)

d)

Ohm (Ω)

149.

The unit of electrical resistance is

a)

Watt (W)

b)

Volt (V)

c)

Ampere (A)

d)

Ohm (Ω)

150.

What is the electrical power when a voltage of 110 V drives a 5 A current through an electrical gadget?

a)

550 W

b)

22 W

c)

55 W

d)

220 W

151.

What is the current when a 600 W AC connected to a 120 V voltage?

P = I X V

a)

3 A

b)

4 A

c)

5 A

d)

6 A

152.

If an electric circuit dissipates energy for 15 W when it draws a current of 3 A, then how much voltage does it have?

P = I X V

a)

45 V

b)

12 V

c)

18 V

d)

5 V

153.
If the Voltage is increased and the resistance stays the same, Current will
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
154.

The current transferred by a circuit is 1A and there is a total resistance of 10 Ohms. What is the power rating for the circuit?

P = I2 X R

a)

10A

b)

10a

c)

10 V

d)

20A

155.

The current transferred by a circuit is 2A and there is a total resistance of 7 Ohms. What is the power rating for the circuit?

P = I2 X R

a)

28W

b)

28V

c)

28A

d)

14W

e)

14V

156.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
157.

A printer uses a current of 4.2A and has a voltage of 12V. How much power does it use?

Pick the right equation to use:

P = E/t

P = I x V

P = I2 x R

a)

50.4W

b)

0.35W

c)

211.68W

d)

2.86W

158.

The current transferred by a circuit is 0.23A and there is a total resistance of 105 Ohms. What is the power rating for the circuit?

Pick the right equation to use:

P = E/t

P = I x V

P = I2 x R

a)

5.6W

b)

24.2W

c)

2,536W

d)

2.86W

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