voltage divider

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voltage divider

A student builds a simple voltage divider circuit on a breadboard.

Definition

Noun: A voltage divider is a simple electrical circuit consisting of two or more resistors connected in series across a voltage source. Its primary function is to produce an output voltage that is a fixed, desired fraction of the input voltage.

Usage

A voltage divider is used to obtain a lower, specific voltage from a higher source voltage without using a more complex regulator. It is a fundamental circuit in electronics for scaling down voltage levels, setting bias points, and creating reference voltages.

Examples
  • The sensor's output is connected to the microcontroller through a voltage divider to ensure the signal is within the safe input range.
  • To measure a battery voltage higher than the analog input can handle, you must first scale it down using a voltage divider.
  • The voltage divider circuit, composed of a 10kΩ and a 5kΩ resistor, provides exactly one-third of the supply voltage at its midpoint.
Advanced Usage
  • Loaded Voltage Divider: In practical applications, when a load (like another circuit) is connected to the output of a voltage divider, it draws current. This changes the effective resistance and alters the output voltage from its calculated, unloaded value. A good design accounts for this load effect.
  • Potentiometer as Adjustable Divider: A potentiometer (variable resistor) is essentially an adjustable voltage divider; moving the wiper selects different fractions of the total voltage across it.
Variants and Related Words
  • Potential Divider: This is a direct synonym for voltage divider.
  • Divider: In an electronics context, this is often used as a shortened, informal form of voltage divider.
  • Resistive Divider: A more specific term emphasizing the use of resistors, as opposed to other components like capacitors (which form an AC voltage divider).
Synonyms
  • Potential Divider
  • Resistive Divider (context-specific)
Related Concepts and Formulas
  • Voltage Divider Rule/Formula: The fundamental principle governing its operation. For two resistors, R1 and R2, in series with an input voltage (Vin), the output voltage (Vout) taken across R2 is: Vout = Vin * (R2 / (R1 + R2)).
  • Impedance Divider: The AC circuit equivalent, using complex impedances (which can include resistors, capacitors, and inductors) instead of simple resistors.
voltage divider

A student builds a simple voltage divider circuit on a breadboard.

Noun
  1. resistors connected in series across a voltage source; used to obtain a desired fraction of the voltage

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