DC circuitsQuestion 1324 of 1506

A 120 V heater draws 6 A. What is its resistance?

  1. 20.0 Ω
  2. 720 Ω
  3. 34.6 Ω
  4. 114 Ω
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Correct answer: 20.0 Ω

R = V ÷ I = 120 V ÷ 6 A = 20.0 Ω.

Source: Computed, 2.1: Ohm’s Law - How Voltage, Current, and Resistance Relate

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Questions last reviewed: 18 October 2026