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.

Noun

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