Fill in the blanks.

Select the missing words in the text.

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How do we calculate percentage efficiency?

Choose 1 answer

(useful energy out ÷ total energy in) × 100

useful energy in ÷ total energy out

(total energy out ÷ useful energy in) x 100

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Which material will have the lowest thermal conductivity?

Choose 1 answer

metal

wood

air

vacuum

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Which of these are ways in which a motor lifting a crate could transfer energy less usefully? (select 4)

Drag the images into the correct place.

Correct Answers

Incorrect Answers

heating the surroundings

heating the cable

transferred mechanically through sound

transferred electrically

transferred mechanically to the crate's GPE store

transferred mechanically to the crate's thermal store

transferred by radiation to the chemical store of the crate

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If a 0.75 efficient motor produces 150 W of useful power, what was the input power?

Choose 1 answer

50 W

112.5 W

150 W

200 W

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Answer incorrect

Look at the slide below to work out the answer.