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Electrons move in a circuit and have millions and millions of collision's.
By 'moving charges' I assume you mean 'electrons'. The electrons will move in a random fashion whether we're talking about DC or AC. However, the electrons will move in 1 general direction in DC while they will move back and forth in AC. one pathway
"closed circuit" describes an electrical pathway for electrons to move from a source to a sink. it also means a voice,video or data transmission by wire, rather than by broadcasting.
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The electrons move
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If that pathway is to ground, it is called a short circuit. It should blow fuses or circuit breakers but can cause fires if protective devices are not functioning right.
All that is required is a conductive pathway between a higher level of charge (negative charge) and a lower level of charge (positive charge). A power source allows charge to flow out into a circuit and back, usually transferring energy. * The electrons themselves do not actually "move" at the speed of the current flow.
Electron cloud i think.
electrons
electrons
Any path that will allow charge to move. Usually it means a good conductor like copper or other metals.