1.7 Energy And Effeciency (GCSE Physics)

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

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

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

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

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

Which of these methods increases efficiency by reducing energy wastage due to air resistance?

Energy efficiency is important primarily because it:

Reducing air resistance helps machines to specifically conserve:

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

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

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

What is the correct equation for calculating efficiency?

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