Resistance converter
Convert between milliohms, ohms, kilohms and megohms: the numbers printed in color bands on every resistor.
That's about the same as a pull-up resistor. Across 230 V that would pass about 23 mA.
What it means
What does that resist?
The current shown is Ohm’s law at 230 V, ignoring everything else in the circuit.
Every unit
Your resistance in every unit
Learn
Three things worth knowing
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Ohm’s law, three ways
V = I × R, I = V ÷ R, R = V ÷ I. Almost every electronics calculation starts from one of these three.
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Ohm was ignored
Georg Ohm published his law in 1827 to a cold reception; critics called it fantasy. He was vindicated years later, and the unit took his name.
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Color bands, not numbers
Resistors are labelled in bands, and 4.7 kΩ is often written 4k7 to stop the decimal point disappearing in a bad photocopy.
Shortcuts
Popular resistance conversions
Background
About resistance units
Resistance measures how much a material fights the flow of current, in ohms. Wires are milliohms, resistors are ohms to megohms, and good insulators are gigohms.