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Electricity (electricity in the home (mains supply (mains supply is ac,…
Electricity
electricity in the home
mains supply
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most electrical appliances are connected to the mains using three core cables meaning they have three wires inside each with a core of copper and a plastic coating
- live wire - brown, provides the alternating potential difference, 230V
- neutral wire - blue, completes the circuit, 0V
- earth wire - green and yellow, protects the wire and for safety, 0V
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alternating current - produced by alternating voltages in which the positive and negative ends keep alternating
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live wire
if you touch the live wire a large voltage is produced across your body and a current flows through you giving you an electric shock
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series circuits
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the total voltage is shared between the various components, so the voltages around the circuit always add up to the source
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parallel circuits
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the total current through the whole circuit is the sum of the currents through the separate components
the total resistance of two resistors is less than the resistance of the smallest individual resistor
power
a battery with a bigger voltage will supply more energy to the circuit and have a bigger current giving it more power