# As Physics - Electricity

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- Created by: Natasha Conley
- Created on: 12-02-13 17:03

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- DC Electricity
- Definitions
- Electric Charge - Property of matter upon which the electric force acts.
- Current - Rate of flow of charge.
- Potential Difference - The energy transferred per unit of charge.
- Resistance: Opposition the the flow of current.
- Resistivity - The amount of resistance given from a unit volume of a substance.

- Units and Symbols
- Equations
- Current: I = Q/T
- Potential Difference: V=W/Q
- Resistance: R=V/I
- Power: P=V/I

- Ohms Law
- If the temperature of a metallic conductor and any other physical features stay constant then the current through a wire is proportional to the potential difference across its ends.
- Straight line graph.
- Origin is passed through.

- If the temperature of a metallic conductor and any other physical features stay constant then the current through a wire is proportional to the potential difference across its ends.
- Circuits
- Series
- In series circuits, the resistance adds to give the total resistance.

- Parallel
- The resistance will be lower than the lowest resistor.

- Series

- Definitions
- Loop Law
- Vs = V1 + V2 + V3
- The total potential difference of all the components across the circuit equals the total input of the voltage in the cell.
- Vs = V1 + V2 + V3

- Definitions
- Electric Charge - Property of matter upon which the electric force acts.
- Current - Rate of flow of charge.
- Potential Difference - The energy transferred per unit of charge.
- Resistance: Opposition the the flow of current.
- Resistivity - The amount of resistance given from a unit volume of a substance.

- Resistivity: Unit: Ohm Meters, ?m Symbol: ?
- Units and Symbols

- Electric Charge Unit: Coulomb, C Symbol: Q
- Current - Unit: Ampere, Amp, A Symbol: I
- Potential Difference - Unit: volt, V Symbol: V
- Resistance: Unit: Ohm, ? Symbol: R

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