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Power (Grades 11-12)

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Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

Power is defined as
  1. the something that enables an object to do work.
  2. how much force an object has.
  3. the rate at which work is done.
  4. energy due to the position of something.
Kaylee and Jessica were moving boxes of quiz bowl questions. They each moved 10 boxes. Jessica moved the 10 boxes in 30 minutes, while Kaylee did it in 20 minutes. Assuming the boxes required the same amount of force to move, and they were all moved the same distance, which of the following is true?
  1. Kaylee did more work than Jessica, because she did it faster.
  2. Jessica did more work than Kaylee, because she worked longer.
  3. Kaylee had more power than Jessica but did not do more work.
  4. None of the above are true.
What unit do we use to measure power?
  1. Newton
  2. Joule
  3. Watt
  4. Kelvin
A small motor does 4000J of work in 20 seconds. What is the power of the motor in watts?
  1. 0.005 Watts
  2. 80,000 Watts
  3. 200 Watts
  4. None of the Above
If Joe lifts a 100-N box 2 m above the floor in 2 s, what is the power output?
  1. 100 W
  2. 300 W
  3. 50 W
  4. 10 W
A 55 kg person walks up a staircase, and a second 55 kg person runs up the staircase. Who develops more power and why?
  1. the person who walks up because he takes more time, using more energy
  2. the person who runs up because he takes less time
  3. same power for both because both cover the same distance with the same force
  4. not enough information to determine
Power is an indication of the level of                    required to perform a given amount of work.
How much energy does an incandescent light bulb rated at 100 W use in one hour?
  1. 36,000 J
  2. 3600 J
  3. 360,000 J
  4. 360 J
If an engine can produce 900 J of energy in 1 min, how many watts can it output?
  1. 0.25 W
  2. 54000 W
  3. 25 W
  4. 15 W
Electrical power is greater if the                      across the circuit is                    or if there is more electric                      through the circuit because electrical power is the product of electric current and voltage.
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