101 Things Everyone Should Know About Science by Dia Michels & Nathan Levy
Author:Dia Michels & Nathan Levy
Language: eng
Format: epub
ISBN: 9780970010667
Publisher: Science, Naturally!
58. When you flip on a light switch, the light turns on. Why?
The electric circuit through the light bulb is closed.
A circuit contains a source of electric current and conducting materials (such as wires) arranged in a loop. When the light switch is turned on, the loop is continuous, or closed, and electricity can flow through the circuit and power the light. If the light is an incandescent bulb, the electricity flows through the bulb’s filament, which heats up so much it becomes white-hot. It is the light given off by the filament that you see when you turn on the light. When the switch is turned off, the loop is broken by the switch and so no current can flow to power the bulb. A circuit that is broken is said to be open.
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