Mains Electricity

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Hazards of Electricity
Frayed cables, long cables, damaged plugs, water around sockets, pushing metal objects into sockets, overloaded sockets.
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Double insulation
Insulated witing and outer casings made from an insulating material (usually plastic); no shock from asing so appliance does not need an earth wire.
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Fuses
The fuse breaks the circuit by melting if a fault in an appliance causes too much current flow.
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Circuit Breaker
Breaks the circuit by electromagnet increasing in strength and attracting the iron bolt. this releases the push switch and breaks the circuit.
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Equation for Power
Power (W) = Current (A) x Voltage (V)
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Equation for Energy Transferred
Energy transferred (J) = Current (A) x Voltage (V) x time(s)
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D.C
Direct current. eg. Batteries. Current always flows in the same direction
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A.C
Alternating current. eg. Mains electricity. Current constantly changes direction.
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Earthing
If the live wire touches the metal case, the current goes through the earth wire to ground. This prevents user getting a shock. Earth wire has a low resistance so large current flows which blows the fuse.
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Other cards in this set

Card 2

Front

Double insulation

Back

Insulated witing and outer casings made from an insulating material (usually plastic); no shock from asing so appliance does not need an earth wire.

Card 3

Front

Fuses

Back

Preview of the front of card 3

Card 4

Front

Circuit Breaker

Back

Preview of the front of card 4

Card 5

Front

Equation for Power

Back

Preview of the front of card 5
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