Electric Resistance Converter

Convert between ohm, megohm, microhm, and other electrical resistance units with scientific precision.

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Electric Resistance Units Explained

Ohm (Ω)

The SI unit of electrical resistance, defined as one volt per ampere. Named after Georg Ohm. 1 Ω = 1 V/A.

Common uses: Resistor specifications, circuit analysis, impedance calculations, electrical design.

Kiloohm (kΩ)

One thousand ohms. 1 kΩ = 1,000 Ω. Most commonly used unit for general electronics.

Common uses: Resistor color codes, standard resistors, circuit design, sensor circuits.

Megohm (MΩ)

One million ohms. 1 MΩ = 1,000,000 Ω. Used for high-impedance circuits.

Common uses: High-impedance measurements, insulation testing, electrostatic discharge protection.

Microhm (µΩ)

One millionth of an ohm. 1 µΩ = 0.000001 Ω. Used for very low-resistance measurements.

Common uses: Contact resistance measurement, superconductor properties, high-current conductor analysis.

Volt/ampere (V/A)

Alternative SI expression of electrical resistance, directly from Ohm's law. 1 V/A = 1 Ω.

Application: Power calculations, circuit design, Ohm's law applications.

Reciprocal Siemens (1/S)

Inverse of the conductance unit siemens. 1 (1/S) = 1 Ω. Used in conductance-resistance relationships.

Application: Conductivity calculations, material properties, reciprocal relationships.

Abohm (abΩ)

CGS electromagnetic unit of resistance. 1 abΩ = 10⁻⁹ Ω. Extremely small unit.

Application: Legacy CGS-emu calculations, historical physics literature, superconductor research.

Statohm (stΩ)

CGS electrostatic unit of resistance. 1 stΩ ≈ 8.987 × 10¹¹ Ω. Extremely large unit.

Application: Theoretical electrostatics, CGS-esu system, historical calculations.

Quantized Hall Resistance (RH)

Fundamental quantum mechanical resistance constant. RH = h/e² ≈ 25,812.8 Ω (at filling factor ν = 1).

Application: Quantum Hall effect measurements, precision resistance standards, fundamental physics research.

Electrical Resistance Context

  • Copper wire (1 mm diameter, 1 m): ~0.017 Ω
  • Typical resistor: 1 Ω to 10 MΩ (common range)
  • Light bulb filament: 10-100 Ω (hot), 1-10 Ω (cold)
  • Electrical wire (household): 0.001-0.01 Ω per meter
  • Water (pure): ~18.2 MΩ·cm at 25°C
  • Human body (skin contact): 1 kΩ to 100 kΩ
  • Insulation (good): > 100 MΩ
  • Superconductor: ≤ 10⁻¹² Ω (essentially zero)
  • Hall effect standard: 25,812.807 Ω (NIST standard)