Street lighting with photoelectric switch

Street lighting with photoelectric switch

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Street lighting with photoelectric switch. The switch (red, top of light) is sensitive to light. As the light levels fall as the Sun sets (as seen here), the switch triggers the street light and turns it on. A photoelectric switch uses an LDR (light-dependent resistor).

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Keywords: electric light, electrical, electricity, electronics, energy, environmentally friendly, industrial, industry, ldr, light, light dependent resistor, light dependent resistors, light-dependent resistor, lit, night, night-time, photoelectric switch, physics, power, power saving, raining, street, street light, technological, technology

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