Red Seal Electrician Practice
Safety and work practicesQuestion 598 of 1506

Why should an electrician remove metal rings before working on a low-voltage, high-current circuit such as a battery bank?

  1. A ring will make the battery voltage rise while it is worn
  2. A ring blocks the current and makes the circuit safe.
  3. A ring causes tetanus at low voltage, even with no contact
  4. A ring can bridge two points in the circuit and burn the finger.
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Correct answer: A ring can bridge two points in the circuit and burn the finger.

Metal is an excellent conductor, and high current through a ring heats it quickly.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.4: Ohm’s Law (again)

Practice safety and work practices

Questions last reviewed: 18 October 2026