4.2 circuit symbols

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14 Terms

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switch

opens or closes an electrical circuit, allowing current to flow through or blocking it off

<p>opens or closes an electrical circuit, allowing current to flow through or blocking it off</p>
2
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cell

provides electrical energy to the charge carriers from stored chemical energy to power the circuit

<p>provides electrical energy to the charge carriers from stored chemical energy to power the circuit</p>
3
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battery

multiple cells connected together to provide a larger amount of energy to the circuit

<p>multiple cells connected together to provide a larger amount of energy to the circuit</p>
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voltmeter

measures the voltage between two points in a circuit

<p>measures the voltage between two points in a circuit</p>
5
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ammeter

measures the current flowing through it

<p>measures the current flowing through it</p>
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fixed resistor

provides a set amount of resistance

<p>provides a set amount of resistance</p>
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variable resistor

a resistor with an adjustable resistance

<p>a resistor with an adjustable resistance</p>
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LDR

a resistor with a resistance that decreases when light intensity increases

<p>a resistor with a resistance that decreases when light intensity increases</p>
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thermistor

a resistor with a resistance that decreases when temperature increases

<p>a resistor with a resistance that decreases when temperature increases</p>
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diode

allows current to flow through it one way only

<p>allows current to flow through it one way only</p>
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LED

a diode that emits light when enough current passes through it

more energy efficient than filament lamps, but sensitive to high currents so usually used with a resistor

<p>a diode that emits light when enough current passes through it</p><p>more energy efficient than filament lamps, but sensitive to high currents so usually used with a resistor</p>
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capacitor

stores electrical energy

<p>stores electrical energy</p>
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lamp

contains a filament that heats up to the point where it glows when enough current passes through it

<p>contains a filament that heats up to the point where it glows when enough current passes through it</p>
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fuse

a safety device that melts, breaking the circuit, if the current exceeds a set level

<p>a safety device that melts, breaking the circuit, if the current exceeds a set level</p>

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