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| | Canada Science and Technology Museum |
 | | When a battery or other electrical source is attached to a wire, which is connected to some form of resistance, (a light, a bell, a motor, etc.), and a circuit is completed back to the source or to ground, free electrons are released into the wire, creating an electrical potential or voltage. |
 | | In his electromagnetic induction theory he stated that an electric current flows in a conductor if that conductor is in a moving magnetic field and is part of a circuit. |
 | | If the electric current surges to a dangerous level, the metal in the fuse melts and the circuit is broken, preventing overheated wires in the walls of the house from starting a fire. |
| www.sciencetech.technomuses.ca /english/schoolzone/Info_Electricity.cfm (1345 words) |
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