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

2
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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

4
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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

6
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diode

allows current in only one direction