E.m.f and Internal Resistance 2.0 / 5 based on 1 rating ? PhysicsD.C. ElectricityASAll boards Created by: ChloeGoslingCreated on: 04-01-13 13:56 What is Internal Resistance (r) When electrons collide with atoms (resistance) inside the battery. So it is called internal resistance. 1 of 6 What unit is Internal Resistance measured in? Ohms, Ω 2 of 6 What is e.m.f (Ɛ) The amount of electrical energy the battery produces for each 1C of charge is called the electromotive force (e.m.f) but it ISN'T a force. 3 of 6 What unit is e.m.f measured in? Volts. V 4 of 6 Eqauations Ɛ=V+v or Ɛ=IR+Ir or V=Ɛ-v or V=Ɛ-Ir 5 of 6 V=Ɛ-Ir for graph of V against I in form of y=mx+c rearrange equation into V= -rI+Ɛ so V:y axis, -r:gradient, I:x axis, Ɛ: y intercept 6 of 6
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