WorksheetsElectric Energy and Power
Total questions: 33
Worksheet time: 4hrs 38mins
Name
Class
Date
1.
What quantities do you need to calculate energy?
a)
Current and Voltage
b)
Power and time
c)
Resistance and current
d)
Power and Voltage
2.
What quantities do you need to calculate power?
a)
Current and Voltage
b)
Power and time
c)
Resistance and current
d)
Power and Voltage
3.
What are the units for energy?
a)
kWh
b)
Joules
c)
Both
d)
Neither
4.
How many kilowatts are in 6500 W
a)
0.65 kW
b)
6.5 kW
c)
65 kW
d)
6,500,000 kW
5.
How many kilowatts are in 500 W
a)
0.5 kW
b)
5 kW
c)
50 kW
d)
500,000 kW
6.
How many kilowatts are in 80 W
a)
0.008 kW
b)
0.08 kW
c)
0.8 kW
d)
8 kW
7.
How many watts are in 0.003 kW
a)
0.3 W
b)
3 W
c)
300 W
d)
3000 W
8.
How many watts are in 2 kW
a)
0.2 W
b)
2 W
c)
200 W
d)
2000 W
9.
How many seconds are in 4 hours
a)
240 s
b)
14400 s
c)
0.067 s
d)
400
10.
How many seconds are in 9 days
a)
540 s
b)
32400 s
c)
12960 s
d)
777,600 s
11.
How many hours are in 90 min
a)
5400 hr
b)
1.3 hr
c)
.5 hr
d)
1.5 hr
12.
How many hours are in 12 min
a)
720 hr
b)
0.2 hr
c)
.12 hr
d)
1.2 hr
13.
What is the electrical energy of a 750 W waffle iron that is used for 15 min
a)
11,250 kWh
b)
11.25 kWh
c)
0.1875 kWh
d)
50 kWh
14.
What is the electrical energy of a 70 W TV that is used for 110 hr
a)
0.63 kWh
b)
7700 kWh
c)
1.57 kWh
d)
7.7 kWh
15.
What is the power rating of a space heater that uses 1.2 kWh of energy in 45 min?
a)
0.026 kW
b)
54 kW
c)
0.9 kW
d)
1.6 kW
16.
What is the power rating of an oven that uses 4 kWh of energy in 2 hours?
a)
0.5 kW
b)
8 kW
c)
6 kW
d)
2 kW
17.
How much time did you play video games if the PS4 uses 110 W of power and you used a total of 16.5 kWh of energy?
a)
6.63 hrs
b)
0.15 hrs
c)
150 hrs
d)
50 hrs
18.
How much time did you cook dinner if the oven uses 1.5 kW of power and you used a total of 13.5 kWh of energy?
a)
9 hrs
b)
0.1 hrs
c)
20.25 hrs
d)
5 hrs
19.
What is the energy used of a light bulb if it is plugged into a 120 V outlet for 90 hrs and has 240 Ohms of resistance?
a)
5.4 kWh
b)
60 kWh
c)
54 kWh
d)
0.5 kWh
20.
How much does it cost to run you 70 W TV for 120 hrs at $0.10 per kWh
a)
$0.84
b)
$840
c)
$8.4
d)
$0.17
21.
What is the equation for power?
a)
V = IR
b)
P = IV
c)
P = IR
d)
P = I/V
22.
What is the unit of electrical power?
a)
watt
b)
volt
c)
ampere
d)
ohm
23.
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
24.
A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
a)
80 W
b)
200 W
c)
2.5 A
d)
4.55 A
25.
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
26.
Calculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
a)
200 W
b)
40 W
c)
2.5 A
d)
79.20 KJ
27.
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
28.
How many amps are in 800mA?
a)
800,000 A
b)
8 A
c)
0.8 A
d)
80 A
29.
If the ammeter shows a reading of 997 mA, how many amps of current is flowing through the circuit?
a)
997 A
b)
99.7 A
c)
9.97 A
d)
.997 A
30.
When measuring a circuit you get a voltmeter reading of 3 volts and an ammeter reading of 600 mA. What is the power being supplied to the device?
a)
1.8 W
b)
1800 W
c)
0.005 W
d)
5 W
31.
What is the total current of ten 90 W light bulbs connected on the same circuit?
a)
0.75 A
b)
7.5 A
c)
1.33 A
d)
13.3 A
32.
20 identical lightbulbs are connected to a circuit. What is the power of each lightbulb if the total current is 15 A?
a)
1800 W
b)
300 W
c)
90 W
d)
8 W
33.
How many 50 W light bulbs can you put on a circuit that can hold a maximum of 10 A
a)
5 Light bulbs
b)
2 Light bulbs
c)
12 Light bulbs
d)
24 Light bulbs
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