wiper arm
Học thuậtThân thiện
Definition
Noun: A mechanical component, specifically a conductive arm, that moves across a series of stationary electrical contacts and stops to make a connection at a designated terminal or outlet. It is a key part in certain types of electrical switches or selectors.
Usage
The term "wiper arm" is used to describe the moving part in a rotary switch, potentiometer, or similar electromechanical device. It "wipes" across the contacts.
Examples
- The technician adjusted the wiper arm to ensure proper contact with the terminal.
- A faulty wiper arm can cause intermittent signal loss in the circuit.
- The selector switch operates by rotating the wiper arm to different fixed contacts.
Advanced Usage
- In automotive contexts, the term is almost exclusively used for the mechanical arms that move windshield wiper blades. However, in electrical engineering, its primary meaning refers to the contacting arm in a switch or variable resistor.
- The position of the wiper arm determines the selected circuit or the resistance value.
Variants and Related Words
- Wiper (noun): Often used as a shorter form for "wiper arm," especially in electrical diagrams.
- Contact Arm (noun): A more general synonym.
- Rotary Switch (noun): A common device that contains a wiper arm.
Synonyms
- Contact arm
- Selector arm
- Moving contact
Notes on Different Meanings
- Electrical/Mechanical Engineering: A conductive arm in a switch or potentiometer.
- Automotive: The linkage arm that physically moves a windshield wiper blade back and forth. (This is a distinct, compound application of the word "wiper").
Related Phrases/Idioms
- Wiper arm travel: Refers to the path or range of motion of the wiper arm.
- Wiper arm contact resistance: The electrical resistance at the point where the wiper arm touches the fixed contact.
Noun
- contact consisting of a conducting arm that rotates over a series of fixed contacts and comes to rest on an outlet