Unit 2.1 Physics 0.0 / 5 ? PhysicsConduction of electricityASWJEC Created by: TigerLilly321Created on: 28-03-17 18:26 The law of conservation of charge The net charge in a system remains constant (provided charges can't enter or leave) 1 of 8 Electric current (symbol and unit) Symbol: I Unit: Ampere (A) = Cs^-1 2 of 8 The electric current through a conductor is Rate of flow of charge (the charge passing per unit time through a cross-section of the conductor) 3 of 8 I=nAve I=current; n=number of free electrons per unit volume; A=; v=drift velocity of free electrons in wire; e=electron charge 4 of 8 The SI unit of charge coulomb (C) 5 of 8 An electron's charge (-e) e=1.6x10^-19 C 6 of 8 Electric current (+equation) The rate of flow of electric charge (I= change in Q / change in t) 7 of 8 Efficiency of a system %Efficiency = 100 x useful work out / work put in 8 of 8
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