Ohm's Law Calculator Online

Ohm’s Law Calculator Online

Welcome to the Ohm’s Law Calculator! This tool allows you to calculate values based on Ohm’s Law, which relates voltage (V), current (I), resistance (R), and power (P) in an electrical circuit.

Simply enter values for any two variables, and the calculator will compute the third. You can use this calculator to solve various electrical problems and understand the relationships between voltage, current, resistance, and power.

Overview of Ohm’s Law

Ohm’s Law, formulated by German physicist Georg Simon Ohm, establishes a fundamental relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. The formula is expressed as V = I * R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms.

Key Features of the Ohm’s Law Calculator

  1. Voltage (V) Calculator: Enter values for current (I) and resistance (R) to calculate voltage (V). This feature helps you understand how the potential difference across a component is influenced by the current flowing through it and its resistance.
  2. Current (I) Calculator: Provide values for voltage (V) and resistance (R) to determine current (I). This function allows you to grasp the relationship between the flow of electric charge and the voltage applied to a circuit with a specific resistance.
  3. Resistance (R) Calculator: Input values for voltage (V) and current (I) to compute resistance (R). This aspect is essential for understanding how materials impede the flow of electric current and how resistance affects the overall behavior of a circuit.
  4. Power Calculator: In addition to the basic Ohm’s Law calculations, our tool includes a power calculator. Enter values for voltage (V) and current (I) to find the power (P) in watts. This feature is crucial for assessing the energy consumption or generation in a given circuit.

How to Use the Ohm’s Law Calculator

  1. Select the desired calculation (Voltage, Current, Resistance, or Power).
  2. Input the known values into the corresponding fields.
  3. The calculator will instantly provide you with the calculated result.
  4. Repeat the process for different scenarios to deepen your understanding of Ohm’s Law.

Frequently Asked Questions

What is Ohm’s Law?

Ohm’s Law is a fundamental principle in electrical engineering, stating that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. Mathematically, it is expressed as I = V / R.

How do I use the calculator?

Enter values for any two variables (voltage, current, resistance, or power), and click the “Calculate” button. The calculator will then determine the missing value based on Ohm’s Law.

Can I leave some fields blank?

Yes, you can leave one field blank, and the calculator will calculate the missing value. However, if you provide values for all fields, the calculator will prioritize calculating power (P).

What units should I use?

Ensure consistent units for voltage (volts), current (amperes), resistance (ohms), and power (watts) for accurate calculations.


Explore the fascinating world of electrical engineering with our Ohm’s Law Calculator. Whether you’re troubleshooting circuits or designing new ones, understanding and applying Ohm’s Law is essential. Use this tool as a valuable resource to simplify complex calculations and deepen your appreciation for the foundational principles that govern electrical circuits.

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