What is the minimum number of inputs required?

You must enter exactly two known values out of Voltage, Current, Resistance, or Power to calculate the remaining two.

How does the calculator handle AC circuits?

In AC mode, the calculator incorporates the Power Factor (cos φ) into the power equation (P = V · I · cos φ) and reports the apparent power.

What is the Power Factor (cos φ)?

It is the ratio of real power to apparent power in an AC circuit, ranging from 0 to 1, representing how effectively electrical power is converted into useful work.

Does the calculator support engineering units?

Yes, the output displays values formatted with standard engineering SI prefixes such as kΩ, mA, and mW for easier reading.

Can I calculate values for a three-phase AC system?

No, this calculator is designed for single-phase AC and DC circuits using standard Ohm's law and single-phase power equations.

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Ohm's Law and Power Triangle Calculator

Solve for two unknowns among Voltage, Current, Resistance and Power from any two given values, with visual triangles and AC power-factor support

Details

What this tool helps you do

Enter any two of V, I, R, P and the calculator derives the other two via Ohm's law (V=I·R) and power equations (P=V·I, P=I²·R, P=V²/R). AC mode applies P=V·I·cos φ and reports apparent power. Renders mnemonic Ohm's law and power triangles plus engineering SI units.

Execution

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Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Solve a simple DC resistor circuit

Given V = 12 V and R = 6 Ω, find the current and power dissipated.

<div>I = 2 A, P = 24 W with Ohm’s law and power triangles.</div>

AC motor: find current from power, voltage and power factor

A 1500 W motor on 230 V AC at cos φ = 0.85 — find the current draw and effective resistance.

<div>AC solve with apparent power and power-factor adjusted current.</div>

Inputs

Set the required fields, then run the tool.

6 options

SettingsAdjust formats, ranges, numbers, and modes.6

Voltage (V, volts)numberOptionalCurrent (I, amps)numberOptionalResistance (R, ohms)numberOptionalPower (P, watts)numberOptionalModeselectOptionalPower Factor (cos φ)numberOptional

Result

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Samples

Ohm's Law and Power Triangle Calculator

What this tool helps you do

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Prepared example runs

Inputs

Result

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Solving a Simple DC Resistor Circuit

2. Calculating AC Motor Current Draw

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