The Voltage Calculator helps you easily find the voltage (V) in an electrical circuit using Ohm’s Law. Just enter the current and resistance to get instant results.

How to Use the Voltage Calculator

Enter:

Current (I) in Amperes
Resistance (R) in Ohms

The calculator will show the voltage in Volts (V).

Voltage Formula

Ohm’s Law: V = I × R
Voltage (Volts) = Current (Amps) × Resistance (Ohms)

Example

Current = 2 Amps
Resistance = 5 Ohms
Voltage = 2 × 5 = 10 Volts

Common Use Cases

Basic electrical projects
DIY electronics troubleshooting
Teaching Ohm’s Law to students
Checking circuit parameters
Designing simple circuits

Why Use a Voltage Calculator?

Avoid manual calculation errors — get accurate voltage instantly for safer and more efficient projects.

Frequently Asked Questions (FAQs)

What is voltage?

Voltage is the electrical potential difference between two points in a circuit.

How do I measure voltage?

Use a multimeter, or calculate using Ohm’s Law with known current and resistance.

Is Ohm's Law always accurate?

It works for linear resistive circuits, but not for complex or non-linear ones.

Can I calculate power too?

Yes! Power (P) = Voltage (V) × Current (I).

Why do I need this?

It saves time and helps you avoid mistakes when designing or testing circuits.

Related tools: Wattage Calculator, Wire Calculator.