Revise GCSE Physics by listening to these revision podcasts from Bitesize and BBC Sounds. BBC Sounds is where you can catch the latest music tracks, discover binge-worthy podcasts or listen to live ...

Generally, the atom has a neutral charge, but if it loses an electron, it becomes positively charged and if the atom gains an electron, it becomes negatively charged. Charged atoms are called ions.

I hope that you are never in a situation in which you are in danger from a downed, but live, power line. However, if that ever happens, the recommended safety procedure is to move away with tiny, ...