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CIRCUIT DIAGRAM
Enter values and click Calculate.
V = I × R
V = P / I
I = V / R
I = P / V
R = V / I
R = V² / P
P = V × I
P = I² × R
How to Use the Ohm’s Law Calculator
This Ohm’s Law calculator helps you quickly find voltage, current, resistance, or power when you know any two values.
Enter any two known values, such as:
The calculator then automatically solves the missing electrical values using Ohm’s Law and the power formula.
The basic power formula is:
P = V × I
Where:
By combining V = IR and P = VI, the calculator can solve all common relationships between:
This makes it useful for students, electricians, electronics learners, technicians, and anyone working with basic circuits.
What Is Ohm’s Law?
Ohm’s Law is one of the most important rules in electricity and circuit analysis. It explains the relationship between voltage, current, and resistance.
The basic formula is:
V = I × R
Where:
In simple words, Ohm’s Law means:
When voltage increases, current also increases.
When resistance increases, current decreases.
For example, if you apply more voltage to a circuit, more current will flow. But if the circuit has higher resistance, less current will pass through it.
Ohm’s Law was introduced by German physicist Georg Simon Ohm in 1827. Today, it is still the foundation of basic electronics, electrical engineering, and circuit troubleshooting.
What the ohm’s law Calculator Results Mean
Voltage:
Voltage is the electrical pressure that pushes current through a circuit. It is measured in volts (V).
Current:
Current is the flow of electric charge through a circuit. It is measured in amperes (A).
Resistance:
Resistance is the opposition to current flow. It is measured in ohms
(Ω).Power:
Power is the rate at which electrical energy is used or converted. It is measured in watts (W).
