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8 Energy – forces doing work

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Question 14

A workshop records the use of two electrical devices during one maintenance job.

DevicePower ratingTotal time switched on
soldering iron50 W30 minutes30\ \mathrm{{minutes}}30 minutes
air compressor1.0 kW60 s

Which comparison of the total energy transferred by the devices is correct?

[1]
A

The soldering iron transfers more energy, and the difference is greater than the energy transferred by the air compressor.

B

The air compressor transfers more energy, and the difference is smaller than the energy transferred by the soldering iron.

C

The air compressor transfers more energy, and the difference is greater than the energy transferred by the soldering iron.

D

The soldering iron transfers more energy, and the difference is smaller than the energy transferred by the air compressor.

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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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