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Convert between all resistance units: ohms, milliohms, kilohms, and megohms. Perfect for electrical engineering and electronics applications.
Electrical resistance is the property of a material or component that opposes the flow of electric current. Measured in ohms (Ω), resistance determines how much current flows for a given voltage according to Ohm's Law (V = IR). Different materials have vastly different resistances, from near-zero in superconductors to billions of ohms in insulators. Understanding resistance is fundamental to designing and analyzing any electrical or electronic circuit.
Choose the unit that gives you the most convenient numbers. Use milliohms for resistances below 1 Ω, ohms for 1-1000 Ω, kilohms for 1-1000 kΩ, and megohms for values above 1000 kΩ. This makes values easier to read and reduces the chance of decimal point errors.
Ohm's Law states that V = IR, where V is voltage in volts, I is current in amperes, and R is resistance in ohms. This fundamental relationship means that for a fixed voltage, higher resistance results in lower current, and vice versa. This law is essential for analyzing all resistive circuits.
Most resistors have tolerances of 1%, 5%, or 10%, so extreme precision in conversion isn't usually necessary. However, for precision applications like measurement circuits or calibration standards, accurate conversions and high-precision resistors (0.1% or better) are essential.
Yes, resistance varies with temperature for most materials. Metals typically increase in resistance as temperature rises (positive temperature coefficient), while semiconductors often decrease (negative temperature coefficient). Temperature-sensitive resistors (thermistors) exploit this effect for temperature sensing.
Resistance is the opposition to DC current flow, measured in ohms. Impedance is the opposition to AC current flow and includes both resistance and reactance (from capacitors and inductors). Impedance is also measured in ohms but is a complex quantity that varies with frequency.