Checking a Fuse with a Digital Multimeter (DMM) A DMM is set to measure resistance on the 20 kΩ range. What reading do you expect when measuring a good 2 A fuse (removed from the circuit)?

Introduction / Context:
A quick continuity test with a DMM verifies whether a fuse is intact. Technicians often use the resistance (ohms) function or the continuity beeper. Knowing the expected reading avoids misdiagnosis when the meter range is high relative to the very low resistance of a good fuse.

Given Data / Assumptions:

• DMM on resistance function, 20 kΩ range selected.
• The fuse is rated 2 A and is tested out of circuit.
• A good fuse behaves as a near-short (very low resistance).

Concept / Approach:

The element inside a healthy fuse is a low-resistance conductor. On a typical DMM, a “good” fuse will read close to 0 Ω (often displayed as 0.0 or a few hundred milliohms, which rounds to 0.00 on a coarse range). An open fuse reads OL or a very large resistance beyond the selected range.

Step-by-Step Solution:

Verification / Alternative check:

Using the continuity mode should produce an audible beep, reinforcing the near-zero reading for a good fuse.

Why Other Options Are Wrong:

0.02 or 0.20 suggest measurable resistance inconsistent with a simple intact fuse on a 20 kΩ range; 2.00 Ω is too high for most small fuses. “None of the above” is unnecessary because 0.00 is expected.

Common Pitfalls:

Testing in-circuit (parallel paths can mislead), touching probe tips together and forgetting to zero out lead resistance, or misreading OL as zero. Always isolate the fuse and use the proper range.

Final Answer:

0.00