E.m.f and Internal Resistance

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What is Internal Resistance (r)
When electrons collide with atoms (resistance) inside the battery. So it is called internal resistance.
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What unit is Internal Resistance measured in?
Ohms, Ω
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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.
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What unit is e.m.f measured in?
Volts. V
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Eqauations
Ɛ=V+v or Ɛ=IR+Ir or V=Ɛ-v or V=Ɛ-Ir
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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
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Card 2

Front

What unit is Internal Resistance measured in?

Back

Ohms, Ω

Card 3

Front

What is e.m.f (Ɛ)

Back

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Card 4

Front

What unit is e.m.f measured in?

Back

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Card 5

Front

Eqauations

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