Free AP Physics C lesson

RL Circuits

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 25 minutes.

Video lessons

  1. RL Circuits - Current Growth

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  2. RL Circuits - Current Decay

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  3. Energy Considerations in RL Circuits

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Practice covered

  1. In an RL circuit with battery mathcalE, resistor R, and inductor L, when the switch closes, the current I(t) grows according to:
  2. An RL circuit has R = 50 Ω and L = 0.10 H. Calculate the time constant tau (in seconds).
  3. When the battery is removed from an RL circuit (but R and L remain connected), the current decays according to:
  4. An RL circuit with time constant 5.0 ms has initial current 2.0 A. Calculate the current (in amperes) after 10 ms. (Use e^-2 approx 0.135)
  5. As current builds up in an RL circuit, the energy supplied by the battery is:
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