Calculate the relationship between voltage, current, resistance, and power.
Input Parameters
A
Ω
W
Calculation Results
Enter two parameters to calculate
Quick Reference
VPotential (Volts)
ICurrent (Amperes)
RResistance (Ohms)
PPower (Watts)
Overview
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. The constant of proportionality is the resistance.
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Pro Tips
V = I × R (Voltage = Current × Resistance)
P = V × I (Power = Voltage × Current)
Unit of Voltage: Volts (V)
Unit of Current: Amperes (A)
Unit of Resistance: Ohms (Ω)
Unit of Power: Watts (W)
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Fun Facts
"Georg Simon Ohm, a German physicist, published this relationship in 1827."
"Ohm's Law is not a fundamental law of nature, but a description of 'ohmic' materials like most metals."
"Superconductors have zero resistance, meaning current can flow without any voltage applied!"
