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changes resistance in the circuit by changing length of resistive material which in turn alters current flowing through the circuit
temperature sensitive resistor, resistance changes with temperature.
temp increase resistance decrease
applications: thermostats fire alarms
changes resistance based on light intensity
light intensity increase resistance decrease
applications: burglar alarms, automatic street lighting
Transformers 'step up' and 'step down' current
Protect expensive components from current surges and act as a safety measure
against fire
diode
allows current in only one direction