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Measure Resistance (Ohms)

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Multimeter basics

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What happens here

To measure resistance, turn the multimeter's dial to the 'Ohms' (Ω) setting. When the probes are not touching anything (an open circuit), the multimeter display will typically show 'OL' (Over Limit) or '1', indicating infinite resistance. When you touch the red and black probes together, the reading should drop to a very small number, close to zero, signifying almost no resistance, as a direct connection provides an easy path for current.

Goal: Understand how to measure electrical resistance.

Tools and materials

  • Black Test Lead — Probing the component
  • Multimeter Klein Tools MM400 — Measuring resistance
  • Red Test Lead — Probing the component

What they say

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this battery reads 20 volts. Next up is hertz. And hertz measures frequency. Normal household power operates at 60 hertz. You can see that's 60 hertz. Ohms measure resistance. With the probes apart, there is no path. If I go ahead and touch them together, there's almost no resistance, and it's going to read close to zero. Continuity uses the same basic idea. This is good for testing things like wire and fuses. Continuity checks whether there's a complete electrical path. If your wire

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