Power Quiz
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5 questions, one answer each
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1. Power is defined as which of the following?
- A. Work done per unit time
- B. Force multiplied by distance
- C. Energy stored in an object
- D. The rate of change of velocity
2. A motor does 4800 J of work in 2 minutes. What is the power of the motor?
- A. 40 W
- B. 400 W
- C. 2400 W
- D. 9600 W
3. Which of the following equations correctly represents power in terms of energy transfer?
- A. P = ΔE × t
- B. P = ΔE/t
- C. P = t/ΔE
- D. P = ΔE + t
4. A light bulb transfers 360 kJ of electrical energy into light and heat energy in 30 minutes. Calculate the power rating of the bulb.
- A. 0.2 W
- B. 12 W
- C. 200 W
- D. 10.8 kW
5. Two devices both transfer 1000 J of energy. Device A transfers this energy in 5 seconds, whilst Device B transfers it in 10 seconds. Which statement is correct?
- A. Both devices have the same power because they transfer the same energy
- B. Device A has twice the power of Device B
- C. Device B has twice the power of Device A
- D. Device A has one-quarter the power of Device B