Electron - Tiny, negatively charged particles.
Light bulb - Invented by Thomas Edison in 1879.
The source can be anything that generates a reasonable voltage but is usually a battery.
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Tuesday, 10th October 2006
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The truth behind the torch
London 2012
London 2012
As the Olympic flame wings its way around the UK, the OU's Aarón Alzola Romero asks: just how immemorial is the Olympic torch relay?
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