# Voltage Divider Rule

**URL:** <https://forumautomation.com/t/voltage-divider-rule/14509>\
**Category:** Electrical\
**Tags:** basic\
**Created:** [October 16, 2026, 11:53am UTC](https://forumautomation.com/t/voltage-divider-rule/14509 "2026-10-16T11:53:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [October 16, 2026, 11:53am UTC](https://forumautomation.com/t/voltage-divider-rule/14509/1 "2026-10-16T11:53:25Z")

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The **[Voltage Divider Rule](https://forumelectrical.com/voltage-divider-rule/)** is used to calculate the voltage drop across individual resistors connected in series.

In a series circuit, the same current flows through all resistors, while the supply voltage is divided among them according to their resistance values. A resistor with a higher resistance has a greater voltage drop.

Formula:

V₁ = Vₛ × R₁ / (R₁ + R₂)

V₂ = Vₛ × R₂ / (R₁ + R₂)

Where:

- Vₛ = Supply voltage
- V₁, V₂ = Voltage drops across resistors
- R₁, R₂ = Resistance values

 ![1](https://cdn.forumautomation.com/original/2X/9/9eacde7b1fb5b4045900052ea5b7b6e698618644.jpeg)

Total Voltage:

Vₛ = V₁ + V₂