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LIGHT OPERATED SWITCH

LIGHT OPERATED SWITCH. Dinieta Indiarni Ines Adhiaksono Putri. Circuit. Light bulb. Ra. battery. Rb. LDR. Circuit concept.

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LIGHT OPERATED SWITCH

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  1. LIGHT OPERATED SWITCH Dinieta Indiarni Ines Adhiaksono Putri

  2. Circuit Light bulb Ra battery Rb LDR

  3. Circuit concept • The circuit senses the ambience of light and depending on the presence/absence of sufficient ambience light. it turns the bulb on/off automatically The bulb gets on when there is insufficient ambience, and switches off when enough ambience is present • This circuit does its job automatically without manual operation

  4. LDR • Light dependent resistor A resistor that act upon light exposure. The circuit symbol is box with a circle . When light falls on the LDR, the resistance, hence the voltage coming across it is decreasing.

  5. How it works • During daytime, when light falls on LDR,the resistance of LDR decreases.the decrement of resistance causes more potential to the other resistor .the potential of across LDR is directly transmitted , because of the low potential difference, across base and emitter, one of them goes cutoff restricting any flow of current from collector to emitter, turning the lightbulb

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