Electric symbols
description
Transcript of Electric symbols
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Electric symbols
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Cell and battery of cells
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Lamp
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Switch
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Voltmeter
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Resistor
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Variable resistor (rheostat)
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Bell/buzzer
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Thermistor
• Resistance decreases with increasing temperature
Temp
Resistance
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Light-dependent resistor (LDR)
• High resistance in the dark but a low resistance in light
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Diode
• Allows current to flow in one direction only (from + to – in the direction of the “arrow)
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Captain Jack Sparrow smoking a cigar
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Two cowboys on a tandem
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Two fried eggs in a frying pan
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3 wizards looking down a well
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• ac/dc• Insulation and double insulation• Earthing, fuses and circuit breakers
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Brainiac – Cattle fence
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Gather round!
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Alternating current
• Current changes direction 50 times a second.
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Fuse
• Thin piece of wire which melts if the current is too high
• If a fault develops, this thin piece of wire melts if the current is too high
• Circuit breakers are sometimes used instead
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Earth wire
• Connects metal body of appliance to earth• If a live wire comes loose, current flows to
earth and blows the fuse
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Double insulation
• Some appliances have no earth wire because they have a plastic outer case
• The plastic case acts as an extra layer of insulation around the wires
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Reading!
• Read carefully pages 192-195• Answer the questions on both pages• Finish for homework due Tuesday 13th
January