Red Seal Electrician Practice
Safety and work practicesQuestion 670 of 1506

An electrician must open a circuit to insert an ammeter in a low-voltage, high-current circuit. What is the hazard?

  1. A shock from the low voltage across the meter
  2. A fall in the resistance of the circuit to zero
  3. A damaging spark when the last probe connection is made
  4. A reversal of the polarity of the circuit
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Correct answer: A damaging spark when the last probe connection is made

A low voltage does not make a circuit safe when the current is high.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.9: Safe Meter Usage

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Questions last reviewed: 18 October 2026