Ohm's law
0 synonyms and 0 antonyms for Ohm's law, grouped by meaning and by how common each one is.
Noun — The rule that the current through a conductor is proportional to the voltage across it and inversely proportional to its resistance, written V = IR: voltage equals current times resistance.
We haven't recorded synonyms for Ohm's law yet. You can still read its full definition, where it comes from, or words that rhyme with it.
How to Use Ohm's Law
The word patterns that sound natural to a native speaker.
Written with a capital O and an apostrophe: Ohm's law. The unit, the ohm, is lower case; its symbol is Ω.
Etymology
Named after Georg Simon Ohm, the German physicist who established the relationship; the unit of resistance, the ohm, is named after him as well.
Full origin of Ohm's law →Frequently Asked Questions
What is the formula for Ohm's law?
V = I × R, where V is voltage in volts, I is current in amps and R is resistance in ohms. Rearranged, I = V/R and R = V/I, so knowing any two values gives you the third.
What is the difference between Ohm's law and the power formula?
Ohm's law relates voltage, current and resistance. The power formula, P = VI, gives the rate at which energy is used, in watts. Combining the two yields the familiar variants P = I²R and P = V²/R.
Does Ohm's law always hold?
Only for ohmic materials, where resistance stays constant. Diodes, transistors, filament lamps and electrolytes are non-ohmic: their resistance changes with voltage, current or temperature, so a plot of current against voltage is not a straight line.