Voltage Current Resistance Power Calculator

What is a Voltage, Current, Resistance, Power Calculator?
A Voltage, Current, Resistance, Power Calculator is a tool based on Ohm's Law and the Power Law — the fundamental principles of electrical circuits. It calculates the relationship between four key electrical quantities:

Voltage (V): The electric potential difference, measured in volts (V)
Current (I): The flow of electric charge, measured in amperes (A)
Resistance (R): The opposition to current flow, measured in ohms (Ω)
Power (P): The rate of energy consumption or generation, measured in watts (W)
Why Use This Calculator?

Simplifies circuit analysis: Quickly determine missing electrical values without manual calculations.
Saves time: Especially useful when designing, troubleshooting, or analyzing circuits.
Reduces errors: Ensures accurate and consistent results using well-established formulas.
Essential for safety: Helps avoid overloading components by calculating proper power and current ratings.
How Does It Work?
The calculator uses the following key formulas:

Ohm's Law:

Power Law:

You typically provide two known values, and the calculator solves for the other two.

When Should You Use This Calculator?

Designing electrical circuits to choose appropriate components.
Troubleshooting circuits to diagnose voltage drops, high resistance, or overcurrent.
Calculating power consumption of devices and systems.
Ensuring safety by checking component ratings (like resistors and fuses).