IGCSE PHYSICS CIRCUIT SYMBOLS
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6 Terms
1
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changes resistance in the circuit by changing length of resistive material which in turn alters current flowing through the circuit
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temperature sensitive resistor, resistance changes with temperature.
temp increase resistance decrease
applications: thermostats fire alarms
3
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changes resistance based on light intensity
light intensity increase resistance decrease
applications: burglar alarms, automatic street lighting
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Transformers 'step up' and 'step down' current
5
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Protect expensive components from current surges and act as a safety measure
against fire
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diode
allows current in only one direction
Note 
Flashcards (251)