1.7 Energy And Effeciency (GCSE Physics)

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

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

How can we practically reduce electrical energy wasted due to resistance?

In energy transfer, what is the `input energy`?

What happens to the efficiency if frictional forces increase?

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

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

What is the maximum possible efficiency percentage of any energy converting device?

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

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

Reducing air resistance helps machines to specifically conserve:

Which formula correctly calculates percentage efficiency?

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