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Lesson Plan: Electromotive Force and Internal Resistance Physics

This lesson plan includes the objectives and prerequisites of the lesson teaching students how to relate the electromotive force (emf) of a battery to its terminal voltage and its internal resistance.


Students will be able to

  • define the term internal resistance,
  • define the term electromotive force,
  • define the term terminal voltage,
  • define the term lost voltage,
  • use the formula 𝜀=𝑉−𝐼𝑟 in all combinations.


Students should already be familiar with

  • Ohm’s law.

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