Energy can be changed from one form to another. It can be transferred from one object to another. Copy and complete the following sentence.

The total amount of energy does not change. This is known as the principal of  of energy.

The diagram represents and energy change.

Copy and complete the word equation for this energy change $:$

Waste energy$=$

The diagram represents and energy change.

Copy and complete the word equation for this energy change $:$

Efficiency$=$

What is the energy conversions $?$ Write an equation.

A glow-worm is an insect that glows in the dark. Chemicals in its body react together to produce light and heat.

What are the energy conversions $?$ write an equation.

An electric motor is used to start a computer's disk drive spinning round.

What are the energy conversions $?$ write an equation.

A wind turbine spins and generates electricity.

What are the energy conversions $?$ write an equation.

Function in a car's brakes slows it down.