Objective:- To test a LDR as darkness detector
and operating a transistor as a switch.
Equipments
required:-1) power supply 5V, Bread board
Components:-1)
LDR, Transistor BC548, LED,resistors-100k, 330Ω.
Theory:- A
light dependent resistor or LDR can be used to detect darkness. The resistance
of a LDR depends on the light falling on it. So it has a dark resistance and
light resistance. This change in resistance drives a transistor into cutoff and
saturation. Here the transistor acts as a switch.
Circuit
diagram:-
Procedure:-1)
measure the LDR resistance in dark and light
2) measure the Vce,Vbe,Ic
when LDR is in darkness and when in light
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