How a Solenoid Works: A Guide
Learn how a solenoid works. This step-by-step guide explains the principle of electromagnetism and how it converts electrical energy into motion.
What is a Solenoid?
Mar 12, 2025Updated Apr 30, 2026
What is a solenoid?
A solenoid is a device comprised of a coil of wire, a housing, and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil, which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.
- The coil is made of many turns of tightly wound copper wire. When an electrical current flows through this wire, a strong magnetic field/flux is created.
- The housing, usually made of iron or steel, surrounds the coil and concentrates the magnetic field generated by the coil.
- The concentrated magnetic field attracts the plunger to the stop, providing the mechanical force to do work.
This article was originally published by TLX Technologies
