Red Seal Electrician Practice
DC circuitsQuestion 834 of 1506

A 120 V source feeds a load of 8 Ω through supply and return wires that total 4 Ω. What is the voltage across the load?

  1. 120 V
  2. 40 V
  3. 80 V
  4. 60 V
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Correct answer: 80 V

Total resistance = 8 + 4 = 12 Ω, so I = 120/12 = 10 A. Load voltage = 10 A × 8 Ω = 80 V. The wires drop the other 40 V.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.5: Specific Resistance

Practice dc circuits

Questions last reviewed: 18 October 2026