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20 October 2014
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Electricity is very dangerous. Circuits powered by batteries can be used for investigation and experiments. However, electrical sockets and anything that is plugged into a socket, should never be played with.

For it to work, an electrical circuit:
  • must have a power source (like a battery)
  • needs something to be powered (like a bulb)
  • must be complete (have no gaps in it).

power cell

Metals are good conductors (this means that electricity can pass easily through them). So, that is why metals are used for electrical cables and wires.

Insulators are the opposite of conductors, electricity cannot pass easily through an insulator. Plastics are good insulators. So they are used to cover wires and as covers for plugs and switches.

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