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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If we streamline an object, what effect does this typically have on efficiency?

Reducing air resistance helps machines to specifically conserve:

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

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

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

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

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

Which of these statements correctly describes useful output energy?

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

What is the correct equation for calculating efficiency?

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

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