# G482 Electricity

- Created by: Charlotte McEwan
- Created on: 12-04-13 16:04

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- G482 Electricity
- Current
- Change in Charge= Current x change in time.
- Q=I x t
- Coulomb is unit of charge and is amount of charge that passes in 1 second when the current is 1 ampere.

- Q=I x t
- Current is the rate of flow of charge.

- Change in Charge= Current x change in time.
- Drift velocity
- Average velocity of electrons
- I = nAvq
- Current depends on drift velocity
- Current
- Change in Charge= Current x change in time.
- Q=I x t
- Coulomb is unit of charge and is amount of charge that passes in 1 second when the current is 1 ampere.

- Q=I x t
- Current is the rate of flow of charge.

- Change in Charge= Current x change in time.

- Current

- P.d. or Voltage
- The energy converted per unit charge moved.
- The energy per unit of charge.
- P.d. or Voltage
- The energy converted per unit charge moved.
- The energy per unit of charge.

- The energy per unit of charge.
- V= W/Q
- The p.d across a component of 1 volt when you convert 1 joule of energy moving 1 coulomb of charge.

- The energy converted per unit charge moved.

- P.d. or Voltage

- The energy per unit of charge.
- V= W/Q
- The p.d across a component of 1 volt when you convert 1 joule of energy moving 1 coulomb of charge.

- The energy converted per unit charge moved.
- Resistance
- R=V/I and is measured in ohms.
- 3 things determine resistance- Length, Area and Resistivity
- Resisitivity: p=RA/L and R=p x 1/A
- In ohmic conductors, R is constant as long as temperature is constant.

- Current

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