DC Voltage Calculator

Instantly calculate Voltage, Current, Resistance, or Power by entering any two known values. The tool automatically applies Ohm's Law and Power Law formulas.

Circuit Parameters

Voltage (V)

Current (I)

Resistance (R)

Power (P)

Enter any 2 values to calculate the others automatically.

Formulas Used

Ohm's Law

V = I × R

Voltage = Current × Resistance

Power Law

P = V × I

Power = Voltage × Current

Quick Guide

Voltage (V): The electrical potential difference, measured in Volts.
Current (I): The flow of electric charge, measured in Amperes (Amps).
Resistance (R): The opposition to current flow, measured in Ohms (Ω).
Power (P): The rate at which energy is used, measured in Watts.

Features

Ohm's Law Analysis

Instantly calculate Voltage (V), Current (I), or Resistance (R) by entering any two known values.

Power Calculation

Determine the Power (P) dissipation or consumption in watts alongside other parameters.

Smart Auto-Calculation

The tool automatically detects which values you have entered and computes the missing ones.

Educational Insights

Learn how the values are derived with clear formula references and relationship explanations.

Error Prevention

Built-in validation prevents invalid inputs like negative resistance to ensure physical accuracy.

Instant Reset

Quickly clear all fields to start a new calculation without refreshing the page.

About DC Voltage Calculator

Our DC Voltage Calculator is a powerful tool designed for students, hobbyists, and professionals working with direct current (DC) circuits. It simplifies the process of analyzing electrical parameters by automatically applying Ohm's Law (V = I × R) and the Power Law (P = V × I). Whether you are designing a circuit, troubleshooting a device, or learning the basics of electronics, this calculator provides instant and accurate results. It eliminates the need for manual calculations and helps you understand the relationship between voltage, current, resistance, and power in a DC system.

How to Use DC Voltage Calculator

Identify Knowns

Determine which two values you know (e.g., Voltage and Resistance).

Enter Values

Input these values into their respective fields. You only need to fill in two fields.

View Results

The calculator will instantly compute and display the remaining two values.

Analyze Power

Check the calculated Power value to ensure components are within their power ratings.