Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law with this easy-to-use calculator.
Category: Calculator
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law
Formula: I = V / R
Current = Voltage / Resistance
Frequently Asked Questions
What is Ohm's Law?
Ohm's Law states that the current flowing through a conductor between two points is directly proportional to the voltage across those points and inversely proportional to the resistance. It is expressed as V = I × R, where V is voltage, I is current, and R is resistance.
How do I use Ohm's Law to find power?
Power (P) in watts can be calculated using Ohm's Law in several ways: P = V × I (voltage times current), P = I² × R (current squared times resistance), or P = V² ÷ R (voltage squared divided by resistance).
When does Ohm's Law not apply?
Ohm's Law doesn't apply to non-ohmic devices where the relationship between voltage and current is not linear. Examples include diodes, transistors, and other semiconductor devices. It also doesn't apply in extreme conditions like very high voltages or temperatures.