Voltage Divider Lab

Master the voltage divider - one of the most useful circuits in electronics.

Overview

Voltage dividers are everywhere - setting reference voltages, reading sensors, adjusting signal levels. This project gives you hands-on experience.

Components Needed

  • 10+x Assorted resistors
  • 1x Multimeter
  • 1x 9V Battery
  • 1x Breadboard
  • severalx Jumper wires

Instructions

  1. Understand the Formula

    Vout = Vin × R2 / (R1 + R2). R1 connects to Vin, R2 connects to ground, Vout is taken from the junction.

  2. Build a 50% Divider

    Use two equal resistors (e.g., two 10kΩ). You should measure half the input voltage at the junction.

  3. Create Specific Voltages

    Calculate and build dividers that produce 3.3V, 5V, and 2.5V from your 9V supply. Verify with your multimeter.

  4. Test Loading Effects

    Add a load resistor and observe how the output voltage drops. Learn why high-impedance dividers are sensitive to loading.

Challenges

  • Design a divider that outputs exactly 3.3V for a microcontroller
  • Create an adjustable divider using a potentiometer
  • Build a multi-tap divider for multiple voltage references