The megohm (symbol: MΩ) is equal to 10⁶ ohms. It is used to measure insulation resistance in cables, capacitors, and high-voltage systems. Good electrical insulation typically has resistance in the megohm to gigohm range.
Ohm
The ohm (symbol: Ω) is the SI unit of electrical resistance. A conductor has a resistance of one ohm when a potential difference of one volt produces a current of one ampere. Named after Georg Simon Ohm, who formulated Ohm's law.
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