Electricity
- Created by: Lamchops
- Created on: 09-01-17 06:29
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- Electricity
- sum of PD = total PD across power supply
- charge negative to positive
- PD= voltage=electromotive force
- parallel
- supply current greater then current in branch
- supply current = total of current in each branch
- supply current greater then current in branch
- AC- alternating current
- mains electricity
- 230v
- 50Hz
- DC- direct current
- one direction
- battery
- 1.5V
- Electrical hazards
- frayed electrical cables
- overheating cables
- water nearby exposed cables/ sockets
- metal objects into sockets
- plugs
- live wire
- brown
- 230V
- next to fuse
- neutral
- blue
- completes circuit
- earth
- green/yellow
- safety
- live wire
- fuse
- breaks circuits when overheated
- 3A, 5A, 8A, 13A
- circuit breakers
- resettable fuse
- double insulation- no fuse
- P=I x V
- energy= I x V x t
- E= V x Q
- Q= I x t
- energy= I x V x t
- Lamps
- filament
- tungsten
- 90% heat
- 10% light
- tube
- more efficient then filament
- filament
- Resistance
- increase
- increase wire length
- decrease thickness
- resistance increase= current decreasing
- V= I x R
- increase
- Electrostatics
- like charges repel
- diff charges attract
- friction transfers electrons
- problems
- dust attracts to insulators- TVs
- synthetic clothing cling
- Dangers
- flammable gases/02- spark ignites causes explosion
- electric shocks
- uses
- photocopiers
- precipitators
- sum of PD = total PD across power supply
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