Free AP Physics C lesson

Current & Resistance

This AP Physics C: Electricity & Magnetism lesson is designed for AP Physics C self-study. It includes 4 video lessons, 7 practice questions, and an estimated completion time of 25 minutes.

Video lessons

  1. Current and the Motion of Charge Carriers

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  2. Current Density and Drift Velocity

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  3. Resistance and Resistivity

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  4. Calculating the Resistance of a Wire Using Resistivity

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Practice covered

  1. Electric current I is defined as:
  2. A wire carries a steady current of 2.5 A. Calculate the total charge (in coulombs) that flows through a cross-section in 4.0 seconds.
  3. The drift velocity v_d of electrons in a conductor is related to current density J by:
  4. Ohm's Law states that for an ohmic conductor:
  5. A resistor has resistance 150 Ω and carries current 0.20 A. Calculate the voltage (in volts) across the resistor.
  6. The resistance R of a wire with length L, cross-sectional area A, and resistivity rho is:
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