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Convert megohms to ohms instantly. Essential for high-resistance measurements, insulation testing, and precision electronics.
Ω = MΩ × 1,000,000
MΩ = Ω ÷ 1,000,000
| Megohms (MΩ) | Ohms (Ω) |
|---|---|
| 0.001 | 1,000 |
| 0.01 | 10,000 |
| 0.1 | 100,000 |
| 0.22 | 220,000 |
| 0.47 | 470,000 |
| 1 | 1,000,000 |
| 2.2 | 2,200,000 |
| 4.7 | 4,700,000 |
| 10 | 10,000,000 |
| 22 | 22,000,000 |
| 47 | 47,000,000 |
| 100 | 100,000,000 |
A megohm (MΩ) is a unit of electrical resistance equal to one million ohms. The prefix "mega" represents a factor of 1,000,000 in the metric system. Megohms are used to measure very high resistances found in insulation materials, high-impedance circuits, and precision measurement equipment. This large unit is essential when working with materials that strongly resist electrical current flow, such as insulators and protective coatings.
The ohm (Ω) is the fundamental SI unit of electrical resistance, honoring physicist Georg Simon Ohm. One ohm represents the resistance between two points when a one-volt potential difference produces a one-ampere current. Ohms are universally used in electrical engineering to quantify how much a material or component opposes current flow. From simple wire resistance to complex circuit impedances, the ohm is the foundation of resistance measurement.
Converting megohms to ohms requires simple multiplication:
Example: 2.2 MΩ × 1,000,000 = 2,200,000 Ω
There are 1,000,000 (one million) ohms in one megohm. The prefix "mega" means million in the metric system, so 1 MΩ = 1,000,000 Ω. This is a fixed conversion factor that applies universally in electrical measurements.
Use megohms when dealing with very high resistance values, typically above 100,000 ohms. Writing "2.2 MΩ" is much clearer than "2,200,000 Ω". Megohms are standard in insulation testing, high-impedance measurements, and specifications for materials with poor conductivity.
10 megohms equals 10,000,000 ohms. This is calculated by multiplying 10 by 1,000,000. A 10 MΩ input impedance is common in oscilloscopes and high-precision voltmeters, ensuring minimal current draw from the circuit being measured.
Measuring megohm-level resistance requires a specialized instrument called a megohmmeter (or "megger") or an insulation tester. Standard multimeters typically can't measure resistances above a few megohms accurately. Megohmmeters apply high voltages (usually 50V to 5000V) to overcome leakage currents and provide accurate readings.
Good insulation resistance typically exceeds 1 MΩ per 1000 volts of operating voltage. For example, a 480V motor should have at least 0.48 MΩ (480,000 Ω) insulation resistance, though values above 10 MΩ are preferred. Industry standards like IEEE 43 provide specific guidelines for different equipment types.
Yes, high-value resistors are available in megohm ranges, typically up to 100 MΩ or higher for specialized applications. However, megohm resistors are sensitive to humidity, contamination, and surface leakage. They require careful handling and often need special mounting techniques to maintain their specified resistance values.