Electricity
- Created by: Sunset
- Created on: 03-04-14 13:50
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- Electricity
- Equations
- V=W/Q
- I=Q/t
- R=V/I
- P=IV
- Definitions
- Potential Differnce
- Work done per coulomb or charge
- In Parallel: Same across all components
- In Series:Divided across components
- Current
- Flow of Charged Particles
- In Parallel: Same along each branch
- In Series: Same across all components
- Resistance
- How easily current passes through a conductor
- Ohms Law
- Resistance is constant if temperature constant
- Ohms Law
- Types of Resistor
- LDR: Greater resistance In dark
- Uses: Security lights and digital cameras
- Thermistor: Higher temperature means less resistance
- Filament bulb: More current - more resistance
- Why? Current is carried by electrons which do work & transfer energy, heating the filament so particles vibrate more so it is harder to pass.
- LDR: Greater resistance In dark
- How easily current passes through a conductor
- Potential Differnce
- Three Pin Plug
- Neutral: BLue - Bottom Left
- Live: BRown - Bottom Right
- Earth: Yellow & Green STripes - Situated Top
- Circuit Breakers
- Fuses
- In Live Wire
- Melt due to large current through Earth and LIve
- Use P=IV to choose
- MCB: Uses an electromagnet
- RCCB: CAn detect a difference of 30mA and cut supply in 40ms
- In Live Wire
- Fuses
- Equations
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