2nd October 2019


What is the use of a battery in a circuit?

The key functions of a battery and bulb in a circuit are explained. A battery is a source of energy which provides a push - a voltage - of energy to get the current flowing in a circuit. A bulb uses the electrical energy provided by the battery, but does not use current.

Why do batteries work?

The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode.

Why do batteries have a and a side?

If electrons make one side of the battery negative, then the other side is lacking those electrons and wants them. Because the positive terminal is lacking those electrons it has a much more positive voltage. It likely has a lot more protons (which are positive) than the negative side of the battery.
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