IG Phy -Electrical Power
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Question 1 of 15
1. Question
1 point(s)Electrical power is measured in watts (W).
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Question 2 of 15
2. Question
1 point(s)1 watt is equal to 1 joule per second.
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Question 3 of 15
3. Question
1 point(s)The typical power rating of an electric kettle is about 2000 W.
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Question 4 of 15
4. Question
1 point(s)Electrical energy can be transferred from chemical stores in a battery to internal energy in a component.
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Question 5 of 15
5. Question
1 point(s)The equation for electrical power is P=IV.
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Question 6 of 15
6. Question
1 point(s)To calculate the energy transferred by a device, use the equation E=IVt.
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Question 7 of 15
7. Question
1 point(s)The power rating of an appliance does not affect the amount of energy it transfers.
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Question 8 of 15
8. Question
1 point(s)The unit for electrical energy is the joule (J).
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Question 9 of 15
9. Question
1 point(s)1 kilowatt-hour (kWh) is equivalent to 3600 joules (J).
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Question 10 of 15
10. Question
1 point(s)Domestic electricity meters measure energy in kilowatt-hours (kWh).
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Question 11 of 15
11. Question
1 point(s)The cost of electricity usage can be calculated using the equation: cost = energy in kWh × cost per kWh.
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Question 12 of 15
12. Question
1 point(s)An appliance with a power rating of 100 W used for 1 hour consumes 0.1 kWh of energy.
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Question 13 of 15
13. Question
1 point(s)The electrical energy transferred by a 12 V heater with a current of 0.50 A over 5 minutes is 150 J.
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Question 14 of 15
14. Question
1 point(s)The equation E=IVt calculates power transferred over time.
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Question 15 of 15
15. Question
1 point(s)Using joules as a measure of energy for domestic electricity usage is practical and convenient.
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