🔍 Key Concepts

• Difference between measuring resistance (ohms), current (amps), and voltage (volts) • What a short circuit between windings in a motor actually means • Which instruments can safely be used on a de‑energized (not running) motor

💭 Think About

• If the motor is not running and should have no power on it, which of these tools can still give you useful information? • To detect a short between windings, do you need to see how hot it gets, how much current flows, what the voltage is, or how much resistance exists between the windings? • Think about which device is normally used to compare resistance between phases of a three‑phase motor to see if one phase is different from the others.

✅ Before You Answer

• Confirm which instruments require the circuit to be energized (powered) versus de‑energized • Check which device is specifically designed to measure resistance between conductors • Eliminate any options that only detect problems after current has been flowing for some time (like heat buildup).