Practice Electrical Power (4.3.1) - Work, Power, and Energy

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10 questions

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Exercise
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Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the formula for power in an electric circuit?
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Think about voltage and current.
Question 2.
Convert 1000 Watts into kilowatts.
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Remember, 1 kW = 1000 W.
3Question 3.
What is the unit of power?
- Joule
- Watt
- Volt
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Consider the formula for power.
4Question 4.
Power can be expressed as P = V × I.
- True
- False
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Think about the roles of voltage and current.
Question 5.
A circuit contains a resistor of 4 ohms and has a current of 5 A flowing through it. Calculate the power consumed in the circuit.
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Remember to square the current.
Question 6.
If a motor rated at 750 W runs for 3 hours, how much energy does it consume in kWh?
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Convert Watts-hour to kWh!

6 more questions in this section. Enroll free to practise them all.