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WorksheetsElectric Power Calculations
Total questions: 21
Worksheet time: 22mins
Name
Class
Date
1.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current
c)
Voltage ÷ Current
2.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
3.
If the hair dryer and the vacuum cleaner are both on, what is the power used?
a)
2600 watts
b)
400 watts
c)
2200 watts
d)
1100 watts
4.
The power of an appliance is...
a)
the amount of voltage going through it
b)
the amount of energy transferred per second
c)
the amount of charge that passes through per second
5.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
6.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
a)
80 W
b)
200 W
c)
2.5 A
d)
22.5 KJ
7.
What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
a)
4.55 A
b)
28800 J or 28.8 KJ
c)
80 W
d)
200 W
8.
If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?
a)
3A
b)
5A
c)
13A
d)
8.7A
9.
The current in an appliance is 3 A and the voltage difference is 120 V. How much power is being supplied to the appliance?
a)
10000 v
b)
220 v
c)
420 v
d)
360 v
10.
What is the current flowing into a microwave oven that requires 700 W of power if the voltage difference is 120 V?
a)
4.3A
b)
6.3 A
c)
5.83 A
d)
none
11.
How does flipping a switch turn a light on?
a)
It steps up the voltage
b)
It generates an electromagnetic field
c)
It opens a circuit
d)
It closes a circuit
12.
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
13.
Watts is the unit of...
a)
Power
b)
Current
c)
Voltage
d)
Resistance
14.
Electrical power can be calculated using...
a)
I2 x R
b)
I x R2
c)
I x R
15.
Calculate the POWER supplied by a 12A current flowing through a 20Ω resistor.
a)
4800
b)
2880
c)
2000
16.
Use
Calculate the RESISTANCE of a component with a power of 20W and 12A current running through it.
a)
0.14 Ω
b)
0.03 Ω
c)
0.70 Ω
17.
Watts is the same as...
a)
Joules per second
b)
Voltage per second
c)
Current per second
18.
When given the voltage and the current, which equation of Power should you use?
a)
Voltage x Current
b)
Current x Resistance2
c)
Voltage2 x resistance
d)
Resistance2 x voltage
19.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
20.
Amps are the same thing as
a)
joules per second
b)
joules per coulomb
c)
coulombs per second
d)
coulombs per joule
21.
Volts are the same thing as
a)
joules per second
b)
joules per coulomb
c)
coulombs per second
d)
coulombs per joule
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