Which of the following is the unit of power?
Mains electricity | Exit Quiz | Oak National Academy

Quiz
•
Science
•
8th Grade
•
Hard
Oak National Academy
FREE Resource
6 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
ohms
volts
amps
watts
joules
Answer explanation
Power is measured in watts.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following devices or appliances has the greatest power rating?
Answer explanation
The device or appliance which has the greatest power rating is the toaster with a maximum power of 1050 W.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many watts are there in a kilowatt?
a thousandth watts
a thousand watts
a million watts
a billion watts
Answer explanation
A kilowatt is equal to a thousand watts; 1 kW = 1000 W.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following values is equal to 0.1 kilowatts?
1 watt
10 watts
100 watts
1000 watts
Answer explanation
0.1 kilowatts is equal to 0.1 × 1000 = 100 watts.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many watts are there in a gigawatt?
100
1000
1 000 000
1 000 000 000
Answer explanation
A gigawatts is equal to a billion watts; 1 GW = 1 000 000 000 W.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the cost of using a 1000 W heater for 30 min, if 1 kWh costs £0.30?
3 pence
15 pence
30 pence
60 pence
Answer explanation
The number of kWh is: 1 kW × 0.5 hr = 0.5 kWh. 0.5 kWh × 30 pence = 15 pence.
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