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light-dependent resistor
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Light-dependent Resistor
Component of electronic circuits whose resistance varies with the level of illumination on its surface. Usually resistance decreases as illumination increases, as the nature of the material is altered by the presence of light. LDRs are used in light-measuring or light-sensing instruments where light intensity is converted to a digital signal (for example, in the exposure-meter circuit of an automatic camera), and in switches (such as those that switch on street lights at dusk).
LDRs are made from semiconductors, such as cadmium sulphide.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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amp
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amplifier
battery
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cell, electrical
circuit (physics)
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conductor (chemistry)
conventional current
coulomb
diode
direct current
electric bell
electric charge
electric current
electric motor
electric power
electricity
electromotive force
electron flow
electronics
energy transfer
farad
generator
insulator
integrated circuit
lamp, electric
LCD
light bulb
light-dependent resistor
light-emitting diode
liquid-crystal display
logic gate
ohm
Ohm's law
operational amplifier
parallel circuit
potential difference
printed circuit board
rectifier
relay
resistance
resistor
semiconductor
series circuit
static electricity
switch
thermistor
thyristor
timer circuit
transistor
volt
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