Current and Potential Difference Note: p59 for circuit diagram and worked examples 3.0 / 5 based on 1 rating ? PhysicsElectricityGCSEAQA Created by: Qiao-ChuCreated on: 08-04-13 09:58 Current Flow of electric charge round a circuit. Current will only flow if there is a potential difference across the component. Unit: ampere A 1 of 12 Potential difference Driving force that pushes current round. Unit: volt V 2 of 12 Resistance Anything in the circuit that will slow the flow down. Unit: ohm Ω 3 of 12 The greater the resistance across a component... ...the smaller the current that flows (for a given potential difference) 4 of 12 Current uses the symbol: I 5 of 12 When a current flows past a point in a circuit for a length of time then the charge passed in given by the formula: Current=Charge/Time I=Q/t 6 of 12 Charge is measured in: Coulombs C 7 of 12 Time is measured in: Seconds s 8 of 12 A bigger current means... ...more charge 9 of 12 Potential difference is... ...work done (energy transferred Joules J) per coulomb of charge that passes between two points in an electrical circuit 10 of 12 Potential difference can also be called: Voltage 11 of 12 Potential difference formula: P.D=Work done/Charge 12 of 12
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