Definition
A variable resistor whose resistance element is wound in a long helix (spiral) inside a cylindrical housing, allowing the wiper contact to travel along the coil through multiple turns of the adjusting shaft. This design provides much finer resolution and greater accuracy than a single-turn potentiometer.
Plain English
An adjustable resistor that you turn many times to change its setting, instead of just once. Because the wire is coiled in a long spiral, each turn of the knob moves the contact only a small amount, so you can dial in very precise values.
Context Anchor
Seen in aircraft electrical, instrument, radio, and autopilot equipment descriptions, especially where a precise internal adjustment is needed.
Derivation
Helical comes from the Greek helix, meaning a spiral or coil. Potentiometer combines potential (voltage) with meter (to measure). The name reflects both the spiral-wound resistance element and the device's role in dividing or measuring voltage.
Why Pilots Care
Pilots rarely adjust these directly, but helical potentiometers are inside many calibration controls and trim adjustments in avionics. Knowing the term helps when reading maintenance manuals or troubleshooting guides.
Analogy
It is like a fine-focus knob on binoculars: several turns produce a small, precise change instead of one quick, coarse movement.
Intuition Check
Do not read “meter” in potentiometer as meaning a cockpit display. Here it means an adjustable electrical part inside equipment.
Example Sentence 1
The technician used a small screwdriver to fine-tune the helical potentiometer until the indicator read exactly zero.
Example Sentence 2
During autopilot rigging the mechanic used a helical potentiometer to fine-tune the pitch control signal.