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Difficulty: EasyMultimeter: Resistance and Continuity

A technician is using a digital multimeter to test a standard cartridge fuse that has been removed from a circuit. If the fuse is intact and in good working condition, what reading should the multimeter display when set to measure resistance?

  1. A
    Infinite resistance or OL\text{OL} (Over Limit)
  2. Approximately 0 Ω0\ \Omega (zero or near-zero resistance)Answer
  3. C
    A voltage reading matching the circuit source voltage
  4. D
    A very high resistance in the megaohm (MΩ\text{M}\Omega) range

Answer

Approximately 0 Ω0\ \Omega (zero or near-zero resistance)
A functional, intact fuse is a continuous electrical conductor designed to offer almost zero opposition to current flow. When tested with a multimeter set to resistance (Ω\Omega) or continuity, it will display a reading of approximately 0 Ω0\ \Omega, confirming complete circuit continuity.

Step-by-Step Solution

1
Identify the internal state of a good fuse.
An unbroken conductive metallic link inside the fuse casing.
Fuses are protective conductors designed to allow electrical current to pass with negligible opposition during normal operation.
2
Determine the expected ohmmeter reading across a continuous conductor.
The meter reads zero or near-zero ohms (0 Ω0\ \Omega).
An ohmmeter sends a tiny test current through the component; because the path is unbroken and non-resistive, resistance is measured at virtually 0 Ω0\ \Omega.

Key Concept

Multimeter resistance and continuity testing across closed conductors versus open circuits
Estimated Time:45s
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Topics

Multimeter: Resistance and Continuity

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