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2.4 Electromotive force and internal resistance

1

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7.

The equation for the graph above is given by :

V = -r I + E

From the graph obtain the value of e.m.f E an! the internal resistan"e r.E=#.$V %%%% sho& e'trapolation to inter"ept at V-a'is

2

V= potential !ifferen"er= internal resistan"eE= e.m.f. of "ellI = (urrent

E

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Ω=

=

−

−=

0.75

2.0

1.5

00.2

5.10.3r

%%.. !ra& a big triangle.

3

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4

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5

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6

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7