Resistance Converter
Resistance Conversion =
Solution in Other Units
| Unit | Value |
|---|---|
| Ohm (Ω) | 1 |
| Kilohm (kΩ) | 0.001 |
| Milliohm (mΩ) | 1000 |
| Megohm (MΩ) | 1e-6 |
Resistance Unit Conversion
Each resistance unit is defined relative to the Ohm as the base unit, so conversions are straightforward power-of-ten multiplications. Enter a value and select a source unit to see all equivalent resistance values.
result = value × f_from / f_to
How It Works
This converter transforms an electrical resistance value from one unit into all other supported resistance units. Each unit is defined relative to the Ohm as the base unit, so conversions are straightforward power-of-ten multiplications.
Example Problem
Convert 4,700 ohms (Ω) to kilohms (kΩ).
- 1 kΩ = 1,000 Ω.
- 4,700 ÷ 1,000 = 4.7 kΩ.
Key Concepts
Electrical resistance is measured in ohms (Ω) and describes a material's opposition to current flow. Resistance unit conversions are straightforward power-of-ten multiplications: 1 kΩ = 1,000 Ω, 1 MΩ = 1,000,000 Ω. Resistance values span many orders of magnitude, from milliohms in power bus bars to gigaohms in insulation testing.
Applications
- Electronics design: converting between ohm, kilohm, and megohm when reading resistor color codes and schematics
- Insulation testing: expressing megohm or gigohm readings from megger tests in standard reporting units
- Power systems: converting milliohm contact resistance measurements for switchgear maintenance records
- Sensor calibration: translating resistance values between unit prefixes for thermistor and RTD specifications
Common Mistakes
- Misreading SI prefix magnitudes — confusing milliohms (10⁻³) with microohms (10⁻⁶) is a 1,000× error that can cause serious design mistakes
- Forgetting that resistance depends on temperature — copper resistance increases about 0.4% per °C; a value measured at 20°C will be different at operating temperature
- Mixing up resistance and impedance — impedance includes both resistance and reactance (from capacitors and inductors) and requires complex number math in AC circuits
Frequently Asked Questions
What is electrical resistance?
Resistance is the opposition to electric current flow in a conductor. It is measured in Ohms and determines how much current flows for a given voltage.
How do you convert kilohms to ohms?
Multiply the kilohm value by 1,000. For example, 4.7 kΩ = 4,700 Ω.
What is a megohm?
A megohm (MΩ) is one million ohms. It is used for very high resistance values found in insulation testing and sensitive electronic circuits.
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