Which of the meters listed should only be...

Question 1 / 27070

Question 1 of 270705eccefa3bacbc34ba4d47f63

Which of the meters listed should only be used after a circuit has been electrically de-energized?

Question 1 of 27070

Which of the meters listed should only be used after a circuit has been electrically de-energized?

🔍 Key Concepts

• Difference between measuring voltage, current, resistance, and power • What happens if you connect a meter in series vs. in parallel with a live circuit • Why some meters can be safely used on energized circuits, while others must be used with power secured and tagged out

💭 Think About

• Think about what an ohmmeter actually measures internally and how it does that. Does it send its own current through the circuit, or does it just sense what is already there? • Which of these instruments is normally connected to a circuit that is already energized during normal operation on a ship? Which one would be damaged or give a false reading if the circuit is live? • For each meter type, ask: is it designed to read conditions in a working circuit, or to check the circuit’s condition before it is energized?

✅ Before You Answer

• Verify which instrument requires the circuit to be isolated and de-energized to avoid damage or incorrect readings • Confirm which meters are routinely used on live electrical panels (like engine room switchboards) for normal monitoring • Make sure you understand the basic function of an ohmmeter compared to ammeters, wattmeters, and frequency meters before choosing your answer