Light energy
Sound energy
Heat energy
Electrical energy
Renewable energy
Sun, wind and water are renewable sources of energy. This type of energy doesn't pollute atmosphere.
Non renewable energy
Coal, gas and oil are non renewable sources of energy. This type of energy pollutes the environment.
1 Turn off lights when we leave a room.
2 Close the windows when the heating is on.
3 Unplug electronic devices.
4 Use public transport.
5 Not waste water.
Simple machines
Compound machines