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Voltage Divider Basics

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Voltage Divider Basics

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Divide voltage with resistors

Created by

DEHI
DEHI
United Arab Emirates

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Voltage Divider Basics
 

Voltage Divider BasicsOnline version

Divide voltage with resistors

by DEHI
1

Slide 1: What is a Voltage Divider?

A voltage divider is a simple circuit that reduces a supply voltage to a lower, usable level using two or more series resistors.

2

Slide 2: Core Formula

For two resistors, Vout = Vin × R2 ÷ (R1 + R2). This determines the output voltage across R2.

3

Slide 3: Circuit Setup

Connect R1 and R2 in series. Apply Vin across the series and read Vout across R2.

4

Slide 4: Choosing Resistors

Higher resistance minimizes current draw but can increase noise and impedance. Balance R1 and R2 for your load.

5

Slide 5: Load Effect

A load connected to Vout changes the divider ratio. The effective resistance becomes parallel with R2, altering Vout.

6

Slide 6: Thevenin View

Any divider seen from the output resembles a Thevenin equivalent: a voltage source and an internal resistance.

7

Slide 7: Typical Uses

Commonly used for biasing, sensor interfaces, and setting reference levels in circuits.

8

Slide 8: Potentiometers

A potentiometer acts as a variable divider, allowing adjustable Vout by turning a knob or slider.

9

Slide 9: Quick Calculation Tip

When accuracy matters, check the load. If Rload is small, recalculate with R2 in parallel to get the real Vout.

10

Slide 10: Practice Problem

Given Vin=12 V, R1=4 kΩ, R2=6 kΩ. Calculate Vout. Use Vout = Vin × R2/(R1+R2) → 7.2 V.
 
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