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Electricity (Static Electricty (Charging by friction between 2 insulators,…
Electricity
Static Electricty
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Like charges repel,opposites attract
Power
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Power = Watts, Energy = Joules, Time = Seconds, Voltage = Volts, Current = Amps
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Cables and Plugs
Earth Wire = Stops metal case being charged if at fault, double insulated, green an yellow,connected to Earth.
Plug = Case insulator, Wires are copper, Live wire, Neutral wire, Pins brass.
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Main circuits
National Grid = Cables and transformers, step down is decrease in PD, Step up increase in PD, Reduce current = energy loss.
Circuits
Parallel = Components on more than one branch, total current is the sum of each branch, PD is the same on each branch. Resistance = 1/R1 + 1/R2
Series = 1 continuous loop, total PD is sum of all cells or components, Resistance = R1 + R2 +..., Same current through each component.
Direct current
PD is one value, Fixed Resistor,
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