1.7 Energy And Effeciency (GCSE Physics)

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

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If an appliance is 10% efficient and 300J of energy are given to it, what is the useful energy output?

When energy is transferred to the surroundings by sound, what is this considered?

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

Energy efficiency is important primarily because it:

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?

Which of the following will NOT increase the efficiency of an electric motor?

What happens to the efficiency if frictional forces increase?

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

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

Which of these statements correctly describes useful output energy?

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