1.9 Energy And Power (GCSE Physics)

The following is a GCSE Physics test covering '1.9 Energy And Power'

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Question 1

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Calculate the efficiency if useful power out is 250 W and total power in is 500 W.

What affects the efficiency of an appliance?

What does wasted power mean?

What is the unit of energy transferred commonly used with power ratings?

Which formula is correct to calculate power?

Order of magnitude calculations give a value rounded to:

A 100 W bulb transfers 2000 J of energy. How much time is needed?

Which power rating is suitable for a railway engine?

How does increasing power affect the rate of energy transfer?

Convert 5 kilowatts to watts.

Which energy transfer is involved when a bulb lights up?

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