Red Seal Electrician Practice
Safety and work practicesQuestion 777 of 1506

A resistor is used to put a load on a large 12 V lead-acid battery for a test. What rating must the resistor have?

  1. A rating of only a few milliwatts
  2. A tolerance of 1 percent or tighter, with any wattage
  3. A power rating high enough for the heat it makes
  4. A voltage rating of 120 V, with the wattage of no importance
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Correct answer: A power rating high enough for the heat it makes

The load resistor gets the full power, so it must be able to handle the heat.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 11.3: Battery Ratings

Practice safety and work practices

Questions last reviewed: 18 October 2026