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

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

When raising an object, what energy store are muscles transferring energy to?

A winch applies 500J of energy to lift a mass, and only 350J becomes gravitational potential energy. What is the efficiency of the winch?

What is the correct equation for calculating efficiency?

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

Reducing air resistance helps machines to specifically conserve:

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

Why does every mechanical system generate heat?

How would you most effectively reduce unwanted noise in a device?

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

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