Traditional Culture Encyclopedia - Traditional culture - Incandescent lamps tend to burn out when the switch is closed. Why?
Incandescent lamps tend to burn out when the switch is closed. Why?
Because when the switch is closed, the current will increase, and the tungsten wire will follow a much larger current than usual. If the current is too large, the heat energy generated by the tungsten wire will be great, which is easy to burn out.
After reconnection, the tungsten wire is brighter than before because of its shorter length, smaller resistance and greater energy.
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