Ohm's Law Calculator
Total Voltage (V)
0 V
Total Current (I)
0 A
Total Resistance (R)
0 Ω
| # | Voltage (V) | Current (A) | Resistance (Ω) | Calculation |
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Ohm’s Law Calculator – Instantly Solve Voltage, Current, and Resistance
Focus Keywords: Ohm’s Law Calculator, Ohm’s Law, Voltage Calculator, Current Calculator, Resistance Calculator, Electrical Calculator, Online Ohm’s Law Tool, V = IR Calculator, Electric Formula Calculator, Ohm’s Law Equation
What Is Ohm’s Law?
Ohm’s Law is a fundamental principle in electrical engineering and electronics. It defines the relationship between voltage (V), current (I), and resistance (R) in an electric circuit.
The law is mathematically represented as:
V = I × R
Where:
V is Voltage (in volts)
I is Current (in amperes)
R is Resistance (in ohms)
With this simple formula, you can calculate any one of the three values if the other two are known.
Why Use an Ohm’s Law Calculator?
Doing calculations manually can be time-consuming and error-prone. Our Ohm’s Law Calculator is designed to help:
Electricians
Students
Engineers
DIY hobbyists
Technicians
With a quick input of any two known values, the calculator will instantly give you the missing third value—accurately and in seconds.
How the Ohm’s Law Calculator Works
Our online Ohm’s Law Calculator is incredibly simple to use. Just follow these three steps:
Choose what to calculate: Voltage (V), Current (I), or Resistance (R).
Enter the known values: For example, if you’re calculating Voltage, input Current and Resistance.
Get instant results: The calculator automatically applies the Ohm’s Law formula and gives you the answer.
Supported Calculations:
Voltage (V) = Current (I) × Resistance (R)
Current (I) = Voltage (V) ÷ Resistance (R)
Resistance (R) = Voltage (V) ÷ Current (I)
Mobile-Friendly Online Tool
Our Ohm’s Law Calculator is fully responsive. Whether you’re using a desktop, tablet, or smartphone, it adjusts perfectly to any screen size. Use it at your workbench, on-site, or even during an exam!
Practical Applications of Ohm’s Law
Understanding and calculating Ohm’s Law is critical in many real-life scenarios:
Designing electrical circuits
Troubleshooting faulty appliances
Determining correct resistor values
Calculating power consumption
Measuring safety levels in live circuits
Whether you’re installing LED lights or building a circuit board, knowing how voltage, current, and resistance interact is key.
Safe, Fast, and Accurate
No downloads required
100% free and browser-based
Instant calculation results
Validates input and avoids errors
Our Ohm’s Law Calculator is built with real-time validation, so it alerts you if any input is missing or invalid (like negative numbers).
Example Calculations
Here are a few examples of how the calculator works in real-world scenarios:
Example 1: Finding Voltage
Current (I): 2 A
Resistance (R): 10 Ω
Result: Voltage (V) = 2 × 10 = 20 V
Example 2: Finding Resistance
Voltage (V): 12 V
Current (I): 4 A
Result: Resistance (R) = 12 ÷ 4 = 3 Ω
Example 3: Finding Current
Voltage (V): 24 V
Resistance (R): 6 Ω
Result: Current (I) = 24 ÷ 6 = 4 A
Additional Features Coming Soon
We’re working to expand this tool with extra features like:
Power Calculation (P = V × I)
Series & Parallel Circuit Solver
Graphical Circuit Visualizer
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