When checking a fuse with an ohmmeter (out of circuit), what resistance reading best indicates that the fuse is intact and functioning correctly?

Introduction / Context:
A fuse is a protective device intended to open (break) a circuit when excessive current flows. Verifying a fuse with an ohmmeter is a quick diagnostic step during troubleshooting of power and control circuits.

Given Data / Assumptions:

• Fuse removed from the circuit for accurate measurement.
• Digital multimeter set to resistance or continuity mode.
• Room-temperature test with no current flowing.

Concept / Approach:
An intact fuse is essentially a short piece of low-resistance metal designed to melt under overcurrent. Therefore, a good fuse should show very low resistance (near zero) and typically will beep in continuity mode. A blown fuse has a melted link and will read infinite or over-range resistance.

Step-by-Step Solution:
Remove fuse from the circuit to avoid parallel paths.Place meter leads on both ends of the fuse.Reading near 0 Ω (often a fraction of an ohm) indicates continuity → good fuse.Reading OL or very high resistance indicates an open → blown fuse.

Verification / Alternative check:
Visual inspection can reveal a broken element or discoloration, but some fuses fail invisibly; the ohmmeter provides definitive electrical confirmation.

Why Other Options Are Wrong:

• Medium or high resistance: A fuse is not a resistor; such readings indicate a problem or a measurement error.
• Infinite resistance: That is the hallmark of a blown fuse.

Common Pitfalls:

• Measuring in-circuit leads to false continuity through alternate paths.
• Confusing continuity beeper thresholds with absolute resistance; meters typically beep below a few ohms which is normal for a good fuse.

Final Answer:
zero ohms resistance