ClarityKitFind a tool
Electrical

Thevenin Equivalent Load Calculator

Calculate load voltage, current and power from a Thevenin source model.

Ideal component relationshipsUnits and assumptions explained below
Circuit workbench
Circuit workbench

Keep RMS, peak and DC values distinct.

See the method

Enter circuit values

Runs on your device

Your circuit result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter thevenin voltage, thevenin resistance, load resistance.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Load current = Vth/(Rth+RL); load voltage = current×RL; load power = current²×RL.

A WORKED EXAMPLE

Using thevenin voltage = 12 V, thevenin resistance = 50 Ω, load resistance = 100 Ω, the result is 8 V. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

Linear resistive DC network represented by its equivalent voltage source and series resistance.

What to keep in mind

Linear resistive DC network represented by its equivalent voltage source and series resistance. Ideal-component calculation for study and estimation. It does not select safe wiring, protective devices or component ratings for an installation.

Common questions

How do I use this thevenin equivalent load calculator?

Calculate load voltage, current and power from a Thevenin source model. Enter thevenin voltage in V, thevenin resistance in Ω, load resistance in Ω. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

Linear resistive DC network represented by its equivalent voltage source and series resistance.

Methodology maintained by ClarityKit. How these tools are built and checked.