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f-alpha.net » Physics » Electricity » Battery » Let's go... » Experiment 8 - Series Circuit IV

Experiment 8 - Series Circuit of Real Batteries

A real battery can be described as an ideal battery with a 0 Ω resistance and an internal resistance Ri in series. When you connect several real batteries together in a series circuit, the total internal resistance is the sum of the individual internal resistances...

Ri = R1i + R2i + R3i + ...

For the example shown of three 9 V batteries with internal resistance of 1.2 W the total voltage becomes...

Three real batteries in a series circuit.

Utotal = U1 + U2 + U3 = 9 V + 9 V + 9V = 27 V

and a total internal resistance of...

Ri = R1i + R2i + R3i = 1.2 Ω + 1.2 Ω + 1.2 Ω = 3.6 Ω

And how act several batteries connected in a parallel circuit?

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