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Introduction - A Basic Circuit

An incomplete battery and lightbulb circuit. A circuit requires an unbroken path of a conducting material, such as metal wire, for current to flow. This circuit is short of wire.
A complete battery and lightbulb circuit. To complete the circuit we add in the missing piece of wire. We know that the conducting path is complete because the light is on.
An incomplete battery and lightbulb circuit. If the light filament burns through the light goes out because the circuit is no longer complete.

Go to Old Light Strings
(aka Lights in Series).

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