What is Ohm’s Law?

Ohm’s Law is a fundamental principle in physics and electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant. This relationship is expressed by the elegant formula:
$$V = I \times R$$ Where:

• V represents Voltage (measured in Volts)
• I represents Current (measured in Amperes)
• R represents Resistance (measured in Ohms)

Understanding and applying Ohm’s Law is crucial for anyone working with circuits, from students learning the basics to professional engineers designing complex systems. It allows us to predict how a circuit will behave and to calculate any unknown value if the other two are known.

How to Use This Tool

1. Select the variable to calculate: Use the dropdown menu at the top to choose the value you want to find (Voltage, Current, or Resistance). This will automatically disable the corresponding input box.
2. Enter the known values: Fill in the two remaining input boxes with the values you have. The tool will perform the calculation in real-time as you type.
3. View the result: The calculated value will appear instantly below the input fields, complete with the correct physics symbol and unit.
4. Reset: Click the “Reset” button at any time to clear all inputs and start a new calculation.

This Ohm’s Law calculator is a powerful aid for students, teachers, engineers, and hobbyists. It simplifies complex calculations and helps you focus on understanding the core principles of electrical circuits.