GCSE Physics Topic 2- Electricity: electric circuit symbols

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  • Created by: Evie123
  • Created on: 21-06-21 12:31
Switch
A switch is used to turn a circuit on (closed) and off (open).
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Lamp
An electrical current heats the filament in a bulb so that it gives out light.
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Fixed resistor
A resistor restricts or limits the flow of electrical current. A fixed resistor has a resistance that does not change.
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Variable resistor
Moving the position of the slider on this resistor, changes the resistance. A variable resistor is used in some dimmer switches and volume controls.
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Thermistor
The resistance of a thermistor depends on its temperature. At low temperatures, the thermistor has a high resistance. As the temperature increases, the resistance decreases. A thermistor can be used in thermostats or heat activated fire alarms.
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Light dependent resistor (LDR)
The resistance of a LDR depends on light intensity. At low light levels, the LDR has a high resistance. As the light intensity increases, the resistance decreases. A LDR can be used as a sensor in cameras or automatic lights that come on when it gets dark
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Semiconductor diode
A semiconductor diode allows current to flow in one direction only. Current will not flow in the other direction. Diodes are used to convert an alternating current into a direct current.
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Other cards in this set

Card 2

Front

An electrical current heats the filament in a bulb so that it gives out light.

Back

Lamp

Card 3

Front

A resistor restricts or limits the flow of electrical current. A fixed resistor has a resistance that does not change.

Back

Preview of the back of card 3

Card 4

Front

Moving the position of the slider on this resistor, changes the resistance. A variable resistor is used in some dimmer switches and volume controls.

Back

Preview of the back of card 4

Card 5

Front

The resistance of a thermistor depends on its temperature. At low temperatures, the thermistor has a high resistance. As the temperature increases, the resistance decreases. A thermistor can be used in thermostats or heat activated fire alarms.

Back

Preview of the back of card 5
View more cards

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