Coursework.Info - Inspiration in an Instant

On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:

Static electricity When materials like silk or polythene become charged with static electricity it is because they are poor conductors or insulators and the electrons stay on the surface. Good conductors like metals allow the electrons to flow away. When the charge builds up it can jump across a gap causing a spark. Static electricity happens in clouds because ice particles rub past each other and build up a charge in the cloud and this charge can jump between clouds or the Earth as lightning. Electric current Electric current is a flow of electrons along a conductor like a metal wire. Electrons come from a source like an electric cell and change places with the metal atom electrons and push the electrons of the metal atoms along the wire. The electric cell gives the electrons energy. Break the circuit and the electrons cannot flow. Electric current is not used up because electrons are...

To see the full version of this document, and 145,348 others