Ohm’s Law Calculator
Calculate voltage, current, resistance, and power instantly with our interactive tool
Interactive Calculator
Calculation Results
Understanding Ohm’s Law
What is Ohm’s Law?
Ohm’s Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance in an electrical circuit. Named after the German physicist Georg Ohm, who first formulated it in 1827, the law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them.
The Ohm’s Law Formula
The mathematical relationship is expressed as:
V = I × R
Where:
| Symbol | Quantity | Unit |
|---|---|---|
| V | Voltage | Volts (V) |
| I | Current | Amperes (A) |
| R | Resistance | Ohms (Ω) |
Power Calculation
Electrical power (P), measured in watts, can be calculated using the formula:
P = V × I
This can also be expressed in terms of resistance and current, or resistance and voltage:
P = I² × R or P = V² / R
Practical Applications
Ohm’s Law is essential for:
- Designing electrical circuits
- Troubleshooting electrical problems
- Selecting appropriate resistors
- Calculating power consumption
- Determining safe operating conditions
How to Use This Calculator
1. Enter any two known values (voltage, current, resistance, or power)
2. Click the “Calculate” button
3. The calculator will compute the missing values using Ohm’s Law and power formulas
4. Use the “Reset” button to clear all fields and start over
- What is Ohm’s Law?
Ohm’s Law defines the relationship between voltage, current, and resistance in an electrical circuit: V = I × R. - How does the Ohm's Law calculator work?
Enter any two values among voltage (V), current (I), or resistance (R) and the tool calculates the third. - Who can use this calculator?
Students, electricians, engineers, and hobbyists can all use this tool. - Is this Ohm’s Law calculator free to use?
Yes, it’s completely free and available online. - Can I use this calculator on mobile?
Yes, it’s mobile-friendly and responsive. - Does the tool show formulas used in the calculation?
Yes, the underlying formula V = I × R is applied and explained. - Can it calculate power as well?
Some versions include power (P = VI) as an optional output. - What units does the calculator use?
Volts (V), Amperes (A), and Ohms (Ω). - Is this calculator accurate for real-world applications?
Yes, it provides theoretical values used in practical circuit design. - Can I embed this tool on my website?
Some providers offer embed codes; check the tool provider. - Is there a limit to the number of calculations?
No, use it as often as you like. - What if I don’t know which two values to input?
You must know at least two of V, I, or R to use the calculator. - Is this calculator suitable for physics students?
Absolutely, it’s a great educational aid. - Does it support complex circuits?
This calculator is for simple series calculations only. - What is the significance of Ohm’s Law in circuits?
It helps understand how voltage, current, and resistance interact. - Can I use decimals in the calculator?
Yes, decimals and fractions are accepted. - Does it work offline?
No, it requires an internet connection unless you download an app. - Is there an app version of this calculator?
Some websites offer downloadable apps or mobile versions. - Can it be used in exams or competitive tests?
It's useful for practice, but calculators may not be allowed in exams. - How can I verify the results?
Manually use the formula V = I × R to cross-check.
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