Answer / thwosif_emrson

By using a LDR needs no manual operation for switching ON
and OFF. When there is need of light. It detects itself
weather there is need for light or not. When darkness rises
to a certain value then automatically street light is
switched ON.

Answer / vijay

LDR=LIGHT DEPENDENT RESISTOR
THE ABBREVIATION ITSELF STATES THAT LIGHT GLOWS DEPENDING
UPON THE VALUE OF RESISTANCE.
LDR IS CONNECTED IN PARALLEL TO THE LIGHT.
IF RESISTANCE IS MORE LIGHT GLOWS MORE EFFECTIVELY
IF RESISTANCE IS LOW LIGHT INTENSTITY WILL BE VERY LESS.

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