1.7 Energy And Effeciency (GCSE Physics)

The following is a GCSE Physics test covering '1.7 Energy And Effeciency'

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Question 1

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Which statement is true of an excessively high calculation of efficiency (more than 100%)?

An electric heater uses a motor that wastes energy through unwanted vibrations. How can this loss be minimized?

An electric motor has a percentage efficiency of 60%. If the total energy supplied is 100J, how much useful energy is delivered?

Why would a lamp rated with 0.4 efficiency still waste energy?

What kind of energy is usually wasted when there is friction between moving parts?

Reducing air resistance helps machines to specifically conserve:

Why does every mechanical system generate heat?

Energy efficiency is important primarily because it:

Why is lubrication useful in increasing the efficiency of an engine?

Which of these statements correctly describes useful output energy?

Why can a device not have an efficiency of more than 100%?

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