Voltage Calculator

Introduction

The Voltage Calculator determines the electrical potential difference in a circuit using Ohm's Law — an essential tool for students, electricians, and hobbyists working with electrical circuits.

How to Use

1. Enter Current (I) in Amperes

2. Enter Resistance (R) in Ohms

3. Click "Calculate Voltage" — voltage will display in Volts

Formula Explanation

Voltage (V) = Current (I) × Resistance (R)

This is Ohm's Law, the fundamental relationship between voltage, current, and resistance in electrical circuits.

Practical Context

Voltage calculations are critical when designing or troubleshooting electrical circuits, selecting appropriate components, and ensuring devices operate safely within their rated specifications. Electricians and hobbyists frequently use this formula when working with household wiring, electronics projects, or automotive electrical systems.

FAQs

Q1: What is Ohm's Law?

Ohm's Law states that voltage equals current multiplied by resistance (V = I × R) — it's the foundational equation for understanding how electricity behaves in a circuit.

Q2: What's the difference between voltage and current?

Voltage is the "electrical pressure" that pushes current through a circuit, while current is the actual flow rate of electric charge — voltage causes current to flow, similar to how water pressure causes water flow.

Q3: Can this calculator be used for both AC and DC circuits?

Ohm's Law applies directly to DC circuits and resistive AC circuits; for AC circuits with reactive components (inductors/capacitors), impedance calculations are needed instead of simple resistance.