Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's Law (V = I × R).
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Ohm's Law Calculator
V = I × R
Ohm's Law Calculator
Ohm's Law defines the fundamental relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = I × R. This law, discovered by Georg Simon Ohm in 1827, is the foundation of circuit analysis and is used in electronics, electrical engineering, and physics.
Common Uses
- Calculating unknown voltage, current, or resistance in a circuit
- Sizing resistors for LED circuits
- Troubleshooting electrical problems
- Electronics hobbyist projects (Arduino, Raspberry Pi)
Frequently Asked Questions
What are the three forms of Ohm's Law?
Ohm's Law can be arranged three ways: V = I × R (voltage = current × resistance), I = V ÷ R (current = voltage ÷ resistance), R = V ÷ I (resistance = voltage ÷ current). Know any two values and you can calculate the third.
What is power in relation to Ohm's Law?
Power (P, in watts) extends Ohm's Law: P = V × I = I² × R = V² ÷ R. These formulas are used to size components properly and prevent overheating. A resistor must be rated for the power it will dissipate.
Is this calculator free to use?
Yes. All calculators on zenicalculator.com are completely free with no registration required.
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