Electrical circuit symbols

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13 Terms

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Lamp

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

<p><span>An electrical current heats the filament in a bulb so that it gives out light.</span></p>
2
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Voltmeter

the voltmeter measures voltage (potential difference) across two points.

<p><span>the voltmeter </span>measures voltage (potential difference) across two points<span>.</span></p>
3
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Ammeter

Used to measure the current in a circuit

<p>Used to measure the current in a circuit</p>
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LDR

resistor whose resistance decreases with increasing light intensity

<p>resistor whose resistance decreases with increasing light intensity </p>
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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.

<p><span>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.</span></p>
6
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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.

<p><span>Moving the position of the slider on this resistor, changes the resistance. A variable resistor is used in some dimmer switches and volume controls.</span></p>
7
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Diode

a circuit component that only allows current to flow in one direction

<p>a circuit component that only allows current to flow in one direction</p>
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LED

a light-emitting diode

<p><span>a </span>light-emitting diode</p>
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Fuse

breaks the circuit if a fault in an appliance causes too much current to flow

<p>breaks the circuit if a fault in an appliance causes too much current to flow</p>
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Cell

An electrical cell converts chemical energy into electrical energy, allowing current to flow from positive to negative terminals.

<p>An electrical cell converts chemical energy into electrical energy, allowing current to flow from positive to negative terminals.</p>
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Battery

A device that stores and provides electrical energy through a chemical reaction, consisting of one or more cells connected together.

<p>A device that stores and provides electrical energy through a chemical reaction, consisting of one or more cells connected together. </p>
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Closed switch

A switch that allows current to flow through a circuit when in the 'on' position.

<p>A switch that allows current to flow through a circuit when in the 'on' position. </p>
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Open switch

A switch that prevents current from flowing through a circuit when in the 'off' position.

<p>A switch that prevents current from flowing through a circuit when in the 'off' position. </p>