Unit 2 - Module 1 DEFINITIONS Electric current 2.0 / 5 based on 1 rating ? PhysicsD.C. ElectricityASOCR Created by: LouisaCreated on: 04-03-13 18:22 Charge (Q) =current*time; =I*t 1 of 6 Coulomb (C) 1A*1s; total charge supplied by a current of 1A in 1s 2 of 6 Kirchhoff's 1st Law The sum of currents entering any junction is always equal to the sum of the currents leaving the junction 3 of 6 Electron drift velocity (v) =I/(nAe) where I is current, n is number density, A is cross-sectional area of wire and e is electron charge 4 of 6 Conductor Contains a large amount of conduction electrons that are free to move within the material; large number densities 5 of 6 Insulator Contains few/no conduction electrons; a very low number density 6 of 6
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