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Science, Physics
4th
grade
Electricity, Energy, Power, and relevant calculations
16 questions
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- 1. Multiple Choice
What is the unit for energy?
Watts
Newton
Joules
kJ/s
- 2. Multiple Choice
When an appliance shows that its power rating is 40W, what does it mean?
It can run for 40 seconds.
It has 40 power.
It consumes 40 W per hour.
It uses 40 J per second.
- 3. Multiple Choice
Which circuit will have a lower total resistance?
circuit with 2 resistors connected in series
circuit with 2 resistors connected in parallel
- 4. Multiple Choice
How is voltage (V), power (P) and current (I) related?
V= P x I
I = P x V
P = V x I
P = I = V
- 5. Multiple Choice
In a circuit with one lightbulb, the ammeter shows 5A, and the voltmeter shows 3V.
What is the power rating of the lightbulb?
0.6 W
1.67 W
8 W
15 W
- 6. Multiple Choice
How many Watts are there in 5.3kW?
0.53 W
5.3 W
530 W
5300 W
- 7. Multiple Choice
A man consumes 40 J of energy while climbing a flight of stairs for 10 s. What is a possible unit for the power of his climb?
W
J
J/h
W/s
- 8. Multiple Choice
The man uses 40 J for climbing his stairs for 10 seconds. Calculate the power of his climb.
4 W
0.4 X 10/60/60 W
400 W
0.25 W
- 9. Multiple Choice
Which appliance is likely to use the most energy when it is turned on for 1 hour?
Fan
Handphone
Oven
Television
- 10. Multiple Choice
A 3kW aircon was turned on for 6 hours. Calculate the power that is consumed in kWh.
0.5 kWh
2 kWh
9 kWh
18 kWh
- 11. Multiple Choice
A 4kW aircon was turned on for 45 minutes. What is the energy used during the 45 minutes?
0.089 kWh
1 kWh
5.33 kWh
180 kWh
- 12. Multiple Choice
A solar panel has a power of 250W. Calculate how much electrical energy can be generated by the solar panel is a day, in kWh.
0.096 kWh
10.4 kWh
6 kWh
6000 kWh
- 13. Multiple Choice
The cost of one unit of electricity is $0.20.
What does it mean by one unit of electricity?
using electricity for 1 second
using electricity for 1 minute
using electricity for 1 hour
using 1 kWh of electricity
- 14. Multiple Choice
A person uses 3kWh of energy for a kettle.
The cost of one unit of electricity is $0.20. What is the cost of using 3kWh of energy?
$0.60
$3.20
$60
$0.0666
- 15. Multiple Choice
During HBL, a person uses the following appliances for the stated amount of time:
-fan (50 W) for 10 hours
-heater (2 kW) for 20 minutes
-TV (1.2 kW) for 2 hours
-laptop (70W) for 5 hours
Which appliance contributed most to the electrical bill?
fan
heater
TV
laptop
- 16. Multiple Choice
The 1.2 kW TV was used for 2 hours.
The cost of a unit of electricity is $0.20.
Calculate the cost of using the TV for 2 hours.
$0.40
$0.48
$480
$4320000
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