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Quickly calculate Thevenin Voltage online with step-by-step results. Use our free Thevenin Voltage Calculator to find Vth easily and understand each formula.
Ever wondered how to simplify a complex circuit into something easier to work with? That’s where Thevenin’s theorem comes in. It helps you replace any linear circuit with a single voltage source and a single resistor. To make things simpler, we’ve developed the Thevenin Voltage Calculator, so you can easily find Thevenin’s equivalent voltage (Vth) without doing manual math.
Our calculator gives you instant results, shows detailed steps, and helps students, engineers, and hobbyists save time while learning the concept in a fun, interactive way.
Thevenin’s Voltage, often written as Vth or Va-b, is the open-circuit voltage seen at the output terminals of a linear circuit. It’s the same as the voltage across the output when no load is connected.
In simple terms, it’s the voltage you’d measure between two points if you removed the load resistor.
Here’s the formula used to calculate Thevenin Voltage:
Va-b = Vs × R3 / (R1 + R3)
Where:
Va-b = Thevenin Voltage (volts)
Vs = Source Voltage (volts)
R1 = Resistance 1 (ohms)
R3 = Resistance 3 (ohms)
This formula comes from the basic voltage divider rule. It divides the total voltage between resistors in proportion to their resistance values.
Let’s go through a simple step-by-step example.
Example 1:
Source voltage (Vs) = 10 V
Resistance 1 (R1) = 3 Ω
Resistance 3 (R3) = 4 Ω
Using the formula:
Va-b = 10 × 4 / (3 + 4)
Va-b = 40 / 7 = 5.71 volts
So, the Thevenin Voltage between points a and b is 5.71 volts.
Example 2:
Source voltage (Vs) = 50 V
Resistance 1 (R1) = 5 Ω
Resistance 3 (R3) = 6 Ω
Va-b = 50 × 6 / (5 + 6)
Va-b = 300 / 11 = 27.27 volts
Our calculator performs these steps instantly and shows the entire process clearly.
It’s that easy! You’ll also see unit conversions like kΩ, MΩ, mV, or kV if you choose them.
The Thevenin Voltage Calculator is perfect for anyone learning or applying circuit theory. It simplifies complex formulas into clean, understandable steps. Whether you’re testing circuit behavior or preparing for exams, this tool helps you master the topic with confidence.
In just seconds, you can find Thevenin’s equivalent voltage and understand exactly how it’s calculated all in one place.
Thevenin’s theorem states that any linear circuit can be replaced by a single voltage source and a series resistor.
It represents the open-circuit voltage at the output terminals of a circuit.
Yes, you can use it for any positive resistance values. Just ensure the sum (R1 + R3) isn’t zero.
Yes, but for AC circuits, resistances are replaced with impedances.
Students, electrical engineers, and DIY electronics enthusiasts can all benefit from it.