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    Electricity was proven to exist since times when amber and fur was rubbed together with the ancient Greeks, inducing the manufacture of static electricity.

    The very first remarkable achievement in this area was by Alessandro Volta, an Italian physicist, who developed the initial circuit in 1800. He also established that a circuit has to be closed, or complete, in order for electricity circulate through it. Science fair experiments could be conducted using circuits that demonstrate this principle.

    Volta’s student, Georg Simon Ohm, made another discovery in 1826. He observed that some materials did not allow electricity to feed freely. To put it differently, they resisted the flowing of electricity through them. This resistance of the circuit is measured by a unit called ohms which is abbreviated from the Greek letter omega (?).

    Things allow electricity to move through them whereas others don’t allow it to go very well. Those materials which permit electricity to advance through options are known as conductive materials. Those materials that resist the passage of electricity through options are called insulators. The resistance of conductive materials are low whereas the resistance of insulators is high. We are able to use copper wire like a conductor and plastic coating being an insulator.

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