Efficiency Year 10 Physics

Front

What is the unit of energy?

Back

Joule

Front

Wasted energy is often lost as...

Back

Heat to the surroundings

Front

Calculate the efficiency of a solar panel with 8.0 joules input and 0.96 joules output.

Back

0.12

Front

A machine is 75% efficient. If it uses 200J of energy, how much energy is useful?

Back

150J

Front

What is the energy transformation in a battery?

Back

Chemical to Electrical

Front

Define efficiency in the context of energy transfer.

Back

Efficiency is the ratio of useful output energy to input energy, expressed as a percentage.

Front

What is the formula for calculating efficiency?

Back

Efficiency (%) = (Useful Energy Output / Total Energy Input) x 100

Front

What does it mean if a machine is 100% efficient?

Back

It means all the input energy is converted into useful output energy with no losses.

Front

What are common forms of wasted energy in machines?

Back

Heat, sound, and vibration.

Front

Explain the concept of energy transformation.

Back

Energy transformation is the process of changing energy from one form to another, such as chemical energy to electrical energy.