What is LDR? Explain
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An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits.
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LDR is a variable resistor that works based on the intensity of light. Its resistance changes in accordance with the change in the intensity of light. Its resistance is maximum when it is in the dark and much less when it is kept in light. Based on this we can save energy a great extent by using street lights only when there is less light. In daytime the resistance of LDR decreases due to the intense light falling on it. Hence current flows to the circuit containing it and as a result the main switch is turned off .If it is dark resistance of LDR increases very much and current through it ceases. The switch in the main circuit get switched ON and the street lamp start giving light.
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