Ohm’s Law Calculator

Ohm’s Law Calculator

Voltage (V)

Volts (V)

Current (I)

Amperes (A)

Resistance (R)

Ohms (Ω)

What is Ohm’s Law?

Ohm’s Law is one of the most fundamental principles in electricity and electronics. It defines the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. This law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to its resistance.

Mathematically, Ohm’s Law is expressed as:

V = I × R

Where:

• V = Voltage in volts (V)
• I = Current in amperes (A)
• R = Resistance in ohms (Ω)

This simple equation allows engineers, students, and technicians to calculate any one of the three quantities when the other two are known. Ohm’s Law is widely used in circuit design, troubleshooting electrical systems, analyzing power consumption, and understanding how electronic devices function.

How to Use This Ohm’s Law Calculator

Using this calculator is very straightforward:

1. Enter any two known values among voltage, current, and resistance.
2. Leave the third field empty.
3. Click the Calculate button.
4. The calculator automatically computes the missing value and highlights it.

If more than two values or fewer than two values are entered, the calculator will prompt you to correct the input.

Worked Example

Suppose you have an electrical circuit where the voltage applied is 12 volts and the resistance of the load is 6 ohms. To find the current flowing through the circuit:

I = V ÷ R = 12 ÷ 6 = 2 A

This means a current of 2 amperes flows through the circuit. Similarly, if you know the current and resistance, you can calculate voltage, or if you know voltage and current, you can calculate resistance.

Ohm’s Law is essential for students studying physics, electrical engineering, electronics, and for professionals working with electrical systems. This calculator saves time, reduces calculation errors, and makes learning concepts much easier.