p2.4 electrical saftey
- Created by: EllieChxpmxn
- Created on: 24-12-16 10:34
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- p2.4 electrical safety
- Domestic electricity
- electricity entering house must first pass the cosumer unit
- sockets in each room/floor arranged in a loop - ring circuit
- Plug sockets
- inner strands of wire made from copper - good conductor
- plug pins made from brass - good conductor and strong
- outer casing made from plastic - good insulator
- earth wires coded green and yellow - connect metal to ground. If excess static charge used earth wire allows charge to flow away safely
- double insulated appliances need an earth wire - no exposed metal parts - no chance of casing becoming live
- fuse - thin wire sometimes enclosed in ceramic cylinder. when current too high fuse will get hot and melt - breaks circuit
- Brown = live wire Blue = neutral wire
- RCCB's
- compares current going in to current going out.
- normal circuit - enters live wire, leaves with neutral
- if something goes wrong leaves through earth
- DC and AC
- DC - current flows in one direction from neg to pos. powered by batteries and solar cells
- AC - current flows both ways, changing direction regularly. flows in mains and from generators.
- charge = current x time
- energy = charge x voltage
- Domestic electricity
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