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Amelia Parker——Studied at the University of Manchester, Lives in Manchester, UK.
So when light shines on the photocell, it turns the transistor on, which energizes the relay's electromagnet, which turns the light off. When it is dark, the photocell has high resistance, so no current flows through the base and the relay is not activated -- the light is on.read more >>+119962023-04-27 17:43:09
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