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

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light operated switch

LIGHT OPERATED SWITCH

Dinieta Indiarni

Ines Adhiaksono Putri

circuit
Circuit

Light bulb

Ra

battery

Rb

LDR

circuit concept
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
slide4
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.

how it works
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