A solenoid, featured in electromagnetic valves and switches of that name, is a?
Solenoid Solenoid A solenoid (/ˈsolə.nɔɪd/) (from the French "solénoïde", derived in turn from the Greek "solen" ("pipe, channel") and "eidos" ("form, shape")) is a coil wound into a tightly packed helix. The term was invented by French physicist André-Marie Ampère to designate a helical coil. In physics, the term refers to a coil whose length is substantially greater than its diameter, often wrapped around a metallic core, which produces a uniform magnetic field in a volume of space (where some experiment might be carried out) when an electric current is passed through it. A solenoid is a type of electromagnet whose
Starter solenoid means that the solenoid will only begin to push the engagement gear, making the metallic click sound. Starter solenoid A starter solenoid (or starter relay) is the part of an automobile which switches a large electric current to the starter motor, in response to a small control current, and which in turn sets the engine in motion. Its function is thus identical to that of a transistor, but using an electromagnetic solenoid rather than semiconductor to perform the switching. In many vehicles the solenoid also engages the starter pinion with the ring gear of the engine. An idle starter solenoid