Question 165Electricity/Electronics - QMED70% to pass
Which of the meters listed should only be used after a circuit has been electrically de-energized?
AI Explanation
You are correct, the answer is D) Ohmmeter.
An ohmmeter should only be used on a de-energized circuit, as it measures the resistance in a circuit. Using an ohmmeter on an energized circuit can damage the meter and potentially create a safety hazard. Ammeters, wattmeters, and frequency meters can all be used to measure properties of an energized electrical circuit.
The other answer choices are incorrect because ammeters, wattmeters, and frequency meters are designed to measure current, power, and frequency, respectively, on active, energized circuits. Using these meters does not require the circuit to be de-energized.
Related Questions
#163 Circuit resistance is usually measured off-line (de-energized) with an ohmmeter. In the absence of an ohmmeter, however, resistance may be INDIRECTLY measured on-line (energized) using what meter (or meters)? #164 Whether analog or digital, what are most AC voltmeters calibrated to measure? #166 What practice could potentially damage a multimeter? #167 Which of the listed statements is correct when using a digital multimeter set up as an ohmmeter? #168 What should be done when performing maintenance of circuit breaker contacts?