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8 Energy – forces doing work

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Question 35
F

A battery-operated fan is switched on. The fan runs at a constant speed.

The Figure shows an energy transfer diagram for the fan.

Figure

image

a.

Give the name of the energy transfer pathway P.

[1]
b.

Box Q shows where the wasted energy ends up.

Give the energy store Q.

[1]
c.

In 10 seconds, 450 J of energy is transferred from the chemical store of the battery.

270 J of this energy is transferred to the kinetic store of the moving air.

Calculate the energy transferred to store Q in this time.

[2]
d.

The battery, the fan and the air in the room form a closed system.

Explain what happens to the total energy of this closed system while the fan is running.

[2]
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8 Energy – forces doing work Questions

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

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