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 does every mechanical system generate heat?

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

Which formula correctly calculates percentage efficiency?

Energy efficiency is important primarily because it:

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

What is the correct equation for calculating efficiency?

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

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

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

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

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

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