One of the most important things you can do at home is to turn electrical appliances off at the socket.

i.e. Don't leave your television on stand-by mode. If you're not watching it, turn it off at the socket.

Also, the same applies to your computer equipment, if you're not using it, turn it off at the socket.

And the same applies again for electric cookers. If you leave it switched on at the wall, they use electricity to run the clock, so it's best to turn it off at the socket.