Ohm's Law Calculator
This calculator is based on Ohm's Law, which states the relationship between voltage, current, resistance, and power. Enter any two known values to calculate the other two.
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Ohm's Law Formulas
Ohm's Law is a fundamental principle in electronics and electrical engineering. It describes the relationship between voltage (V), current (I), resistance (R), and power (P).
Ohm's Law Chart
| Quantity | Formula from V & I | Formula from V & R | Formula from I & R |
|---|---|---|---|
| Voltage (V) | - | - | I × R |
| Current (I) | - | V / R | - |
| Resistance (R) | V / I | - | - |
| Power (P) | V × I | V² / R | I² × R |
Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It is expressed as V = I × R.
Does Ohm's Law apply to all components?
Ohm's Law applies to components with linear resistance, such as resistors. It does not apply to non-linear components like diodes, transistors, or batteries.
What is the difference between resistance and impedance?
Resistance is the opposition to current flow in a DC circuit. Impedance is the opposition to current flow in an AC circuit, and it includes both resistance and reactance (opposition to change in current or voltage).