Electric Power and Energy MCQs
Practice Electric Power and Energy multiple-choice questions from Electricity (Class 10 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Electric Power and EnergyQuiz - Solve & Score
Q1. Which expression for power uses only current and resistance?
- A.P = I^2 R
- B.P = VI
- C.P = V^2 / R
- D.P = V/I
Answer: A. P = I^2 R
Q2. Which appliance generally has the highest power rating?
- A.a small fan
- B.a mobile phone charger
- C.an electric geyser/heater
- D.an LED night lamp
Answer: C. an electric geyser/heater
Q3. Which formula would you use to find power if only V and R are known?
- A.P = V^2 / R
- B.P = I^2 R
- C.P = I / V
- D.P = V I
Answer: A. P = V^2 / R
Which principle settles this? Electric power P = V*I = I^2*R = V^2/R, and energy E = P*t; pick the version matching the data and substitute the listed values => P (or E) drops out as a single number; hence the answer = P = V^2 / R. Does that line up with one of the options? Yes - Correct. And the rest? option B) 'P = I^2 R' fails since That needs the current, not given here; option C) 'P = I / V' fails since That is not a power formula. Pick: A) P = V^2 / R.
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