DC Voltage Calculator

Calculate voltage, current, resistance, and power in DC circuits.

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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

  • 1
    Identify Knowns

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

  • 2
    Enter Values

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

  • 3
    View Results

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

  • 4
    Analyze Power

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

Frequently Asked Questions

Only for purely resistive AC loads (like heaters). For circuits with motors or capacitors, use the dedicated AC Voltage calculator.
Mathematically, this leads to infinite current (a short circuit). In reality, this would blow a fuse or damage the power source.
Yes, in DC circuits, power (in Watts) is the product of Voltage (Volts) and Current (Amperes).
It is the fundamental relationship in electronics: V = I × R (Voltage = Current × Resistance).
You can use the formula V = P / I. Our calculator handles these permutations automatically.
Resistance is measured in Ohms (Ω). For very high values, you might see Kilo-ohms (kΩ) or Mega-ohms (MΩ).