Practice Power In Electric Circuits (4.3) - Work, Power, and Energy

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9 questions

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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 how voltage and current interact.
Question 2.
How many watts are in a kilowatt?
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Consider the metric prefixes.
3Question 3.
What is the formula for calculating electrical power?
- P = V + I
- P = V × I
- P = I / V
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Consider how power relates to work done.
4Question 4.
True or False: Increased resistance in a circuit will decrease power if voltage remains constant.
- True
- False
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Think about relationships between resistance and power.
Question 5.
Calculate the power consumed by an appliance that operates at 120V and 5A.
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Use the power formula directly.
Question 6.
If a device is rated at 1500W and operates for 2 hours, how much energy does it consume in kWh?
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Remember to convert Watts to kilowatts.

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