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In Ohm's law, current through a resistor is directly proportional to what?

Current is proportional to the applied voltage.

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  1. The resistance of the material
  2. The voltage applied across it ✔
  3. The frequency of the supply

Why: Double the voltage across the same resistor and the current doubles. Resistance sits on the other side of the equation, so more resistance means less current.

Huh, didn't know that: OpenStax reads V = IR as the voltage drop across a resistor produced by the flow of current.

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What was the electrician/detective's name? Sherlock Ohms.
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References

Answer: The voltage applied across it. Double the voltage across the same resistor and the current doubles. Resistance sits on the other side of the equation, so more resistance means less current.

  1. OpenStax College Physics 2e, 20.2 Ohm's Law openstax.org/books/college-physics-2e/pages/20-2-ohms-law-resistance-and-simple-circuits
    The current that flows through most substances is directly proportional to the voltage V applied to it.
    Checked 2026-10-10.

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