Unit 1 Section 3 E.m.f. and Internal Resistance

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What is Internal Resistance?

Resistance comes from electrons colliding with atoms and losing energy.

In a battery, chemical energy is used to make electrons move.

As they move, they collide with atoms inside the battery - so batteries must have resistance. Called internal resistance.

Load resistance is the total resistance of all the components in the external circuit.

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What is e.m.f.?

The amount of electrical energy the battery produces and transfers to each coulomb of charge is called its electromotive force or e.m.f. in volts.

e.m.f. = E / Q

e.m.f. = electromotive force in volts (V)

E =

Q =

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