b) Electromotive force

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Last updated 3:46 PM on 2/20/26
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4 Terms

1
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  • state what potential difference describes in terms of work done

  • when charge carriers do work on a component

  • → charge carriers are losing energy

2
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  • state what electromotive force describes in terms of work done

  • when an e.m.f. source does work on charge carriers

  • → charge carriers are gaining energy

3
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  • define electromotive force

  • the joules of chemical energy transferred from an emf source to the electrical store of one coulomb of charge

4
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  • state the formula for electromotive force

  • ε = W / Q

  • electromotive force of an emf source (V) = chemical energy transferred by the component (J) / charge passing through the emf source (C)