Definition
A circuit arrangement, typically using two or more resistors connected in series across a voltage source, that produces a smaller output voltage tapped from a point between the resistors. The output voltage is a fixed fraction of the input voltage, determined by the ratio of the resistor values.
Plain English
A simple circuit that takes a larger voltage and gives back a smaller, predictable portion of it by splitting it across resistors.
Context Anchor
Seen in aircraft electrical-system diagrams, instrument circuits, sensor circuits, and maintenance troubleshooting.
Derivation
Plainly named for what it does: it divides voltage. The word 'divide' comes from the Latin 'dividere,' meaning 'to split.' The circuit splits the source voltage into smaller portions across each resistor.
Why Pilots Care
Pilots rarely interact with voltage dividers directly, but understanding the concept helps when troubleshooting instrument or sensor faults, since many cockpit gauges rely on a divided reference voltage to read correctly.
Analogy
Think of water pressure dropping in stages as it passes through two narrow pipes in series. The pressure at the joint between them is lower than at the source, and how much lower depends on the size of each pipe.
Intuition Check
A voltage divider does not create extra electrical power. It takes an existing voltage and provides a lower voltage for another part of the circuit.
Example Sentence 1
The fuel quantity sensor uses a voltage divider to supply a low reference voltage to the gauge circuit.
Example Sentence 2
During preflight checks, a technician measured the output of the voltage divider feeding the fuel gauge.