What does a reading of .250 MΩ represent?

A reading of .250 MΩ, or 0.250 megohms, represents 250,000 ohms. The metric prefix "mega" denotes a factor of one million, so when you see "MΩ," you multiply the value by one million to convert it into ohms.

In this case, .250 MΩ can be converted to ohms by performing the calculation:

0.250 × 1,000,000 = 250,000 Ω.

This measurement is typically used in electrical testing to assess insulation resistance, wherein higher resistance readings indicate better insulation quality and lower risk of electrical leakage. Understanding this conversion is crucial for diagnosing potential issues in electrical systems or ensuring compliance with safety standards.