Free AP Physics C lesson

Power & EMF

This AP Physics C: Electricity & Magnetism lesson is designed for AP Physics C self-study. It includes 3 video lessons, 5 practice questions, and an estimated completion time of 20 minutes.

Video lessons

  1. Power Dissipated in a Resistor

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  2. Terminal Voltage of a Battery and Internal Resistance

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  3. Maximum Power Delivered by a Source with Internal Resistance

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Practice covered

  1. The power P dissipated in a resistor can be calculated using:
  2. A 100 Ω resistor carries current 0.50 A. Calculate the power dissipated (in watts).
  3. A real battery with EMF mathcalE and internal resistance r delivers terminal voltage V when current I flows. The relationship is:
  4. A battery has EMF 12 V and internal resistance 0.50 Ω. When it delivers 2.0 A, calculate the terminal voltage (in volts).
  5. For a battery with internal resistance r connected to external load R, maximum power is delivered to the load when:
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