As Physics - Electricity

• 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.
• Circuits
• Series
• In series circuits, the resistance adds to give the total resistance.
• Parallel
• The resistance will be lower than the lowest resistor.
• 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