Simple machines are made up of few pieces.
Simple machines use human energy.
A wheelbarrrow is a simple machine
A hammer is a simple machine.
Complex machines are made up of many pieces.
Complex machines use electricity, petrol or human energy to work.
A drill is a complex machine.
It works with electricity.
A lorry is a complex machine.
It works with petrol.
A bike is a complex machine.
It works with human energy.
Machines can also be manual or automatic.
Manual machines work with human energy.
A spade is manual.
Automatic machines work with petrol or electricity.
A dishwasher is automatic. It works with electricity.
A scooter is automatic. It works with petrol.
Computers are complex machines: they are made up of many pieces:
A screen
A keyboard
A printer.
A mouse.
A CPU
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