Definition

1. Noun:
   • A unit of electrical resistance: A "megohm" is a unit of measurement for electrical resistance equal to one million ohms (1,000,000 Ω). It is used to measure very high resistance values.

Examples of Usage

• Noun:
  • The insulation resistance of the cable was measured at 500 megohms.
  • This high-voltage component requires a resistor rated for several megohms.

Advanced Usage

• "Megohm meter" (often written as "megohmmeter"): A specialized instrument used to measure very high resistance values, typically in the megohm range. It is commonly used for testing insulation.
  • The electrician used a megohmmeter to check the motor's winding insulation.

Variants and Related Words

• Ohm (Ω): The base unit of electrical resistance. One megohm equals one million ohms.
• Kilohm (kΩ): A unit of resistance equal to one thousand ohms.
• Gigaohm (GΩ): A unit of resistance equal to one billion ohms.

Synonyms

• MΩ: The standard symbol for megohm.
• Million ohms: A descriptive synonym.

Related Phrases and Technical Terms

• Insulation resistance: A common property measured in megohms to determine how well a material insulates against electric current.
  • Good insulation should have a resistance in the megohm range.
• Leakage current: A very small current that flows through a high-resistance path (often measured in megohms) in an insulator or semiconductor.

Noun

1. a unit of resistance equal to one million ohms