WorksheetsElectrical Power
Total questions: 25
Worksheet time: 25mins
What is the unit of Electrical Power?
Joule
Watt
Where
Amp
If the hair dryer and the vacuum cleaner are both on, what is the power used?
2600 watts
400 watts
2200 watts
1100 watts
Electrical power can be calculated using
Resistance x Voltage
Voltage x Current
Voltage ÷ Current
What is the unit of power in electrical systems?
Joule
Watt
Volt
Ampere
A 120 Vac - 20 A circuit breaker max power rating
240 watts
24 watts
2400 watts
240 volts
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
170 W
170 A
1.7 V
1.7 W
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
80 W
200 W
2.5 A
22.5 KJ
If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?
3A
5A
13A
What is the power of a 20V bulb with 5A through it?
100W
100V
6.3W
6.3A
Your oven has a power of 5000 watts. How many kilowatts is this?
(a)
What is the power rating of a home appliance (in kilowatts) that uses 8 amps of current plugged into a 120 Volt outlet?
(a)
A pair of 15-watt computer speakers are connected to a 12-volt power supply. What is the electric current running through the speakers?
1.25 A
0.8 A
12.5 A
180 A
A kilowatt (kW) is how many watts?
10
50
100
1000
Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps
300 volts
30 volts
12 volts
0.08 volts
Heater is 240V and 2200W. What is the suitable fuse rating for the heater?
10 A
13 A
3 A
5 A
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. What amount of power is used by the alarm clock?
(a)
A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through its coil. What is the power used by the subwoofer?
(a)
If a toaster produces 12 watts of power in a 120-volt circuit, what is the amount of current in the circuit?
(a)
An electric heater works by passing a current of 50 A though a coiled metal wire, making it red hot, and uses 120 W of power. What voltage must be applied to run the heater?
(a)
What current flows through a hair dryer plugged into a 12 Volt circuit if it uses 25 W of power? (Round to 2 decimal places)
(a)
A clothes dryer in a home has a power of 4,500 watts and runs on a special 220-volt household circuit. What is the current through the dryer? (Answer to 2 decimal places)
(a)
What is the resistance of a 60 watt light bulb operated at 120 volts?
(a)
How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?
(a)
A heater produces a current of 5 A when plugged into a socket that provides 40 V. What is the power used by the heater?
(a)
Electrical Power
Joule
Watt
Volt
Ampere
