How to Divide Voltage in Half with Resistors


When working with electronic circuits, it is often necessary to divide the voltage across a circuit or component to achieve a desired voltage level. One common requirement is to divide the voltage in half, which can be accomplished using resistors. In this guide, we will explain how to divide voltage in half using two 10KΩ resistors, along with the necessary components and steps involved.

Components Required

  1. Two 10KΩ resistors
  2. Jumper wires
  3. 5v Power Supply


To divide voltage in half using resistors, we can create a voltage divider circuit. The principle behind a voltage divider is based on Ohm’s Law, which states that the voltage across a resistor is directly proportional to the current passing through it and inversely proportional to its resistance. Here’s how you can divide voltage in half with two 10KΩ resistors:

  1. Connect one end of the first 10KΩ resistor to the positive terminal of the voltage source (e.g., a battery or power supply). This will be the input terminal of the voltage divider.
  2. Connect the other end of the first resistor to one end of the second 10KΩ resistor.
  3. Connect the other end of the second resistor to the negative terminal of the voltage source. This will be the ground or reference terminal of the voltage divider.
  4. Measure the voltage across the second 10KΩ resistor using a voltmeter. You will find that the voltage is approximately half of the input voltage.

The reason the voltage is divided in half is because the two resistors create a voltage divider network. The voltage across each resistor depends on the ratio of their resistances. Since both resistors have the same resistance (10KΩ in this case), the voltage across each resistor is equal. Therefore, the voltage across the second resistor will be half of the total voltag

Voltage Divider Circuit for Half the Voltage

The voltage divider circuit which allows us to obtain half the voltage from the voltage supply is shown below.


Diagram Breadboard



  1. Biasing transistor circuits: Voltage dividers are used to provide biasing voltages for transistors, ensuring they operate within their specified range.
  2. Analog signal conditioning: Voltage dividers are employed to scale down analog signals to appropriate levels for processing or measurement.
  3. Sensor interfacing: When connecting sensors to microcontrollers or analog-to-digital converters, voltage dividers are used to adjust the sensor output to the desired voltage range.


Dividing voltage in half using resistors is a fundamental technique in electronics. By creating a voltage divider circuit with two resistors, such as two 10KΩ resistors, it is possible to achieve a voltage output that is half of the input voltage. This technique has various applications in biasing circuits, analog signal conditioning, and sensor interfacing. Understanding how to divide voltage using resistors is essential for designing and troubleshooting electronic circuits

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