How do you make an ignition coil?

To make an ignition coil, you start by wrapping insulated copper wire around a magnetic core, usually made of iron, to create a primary and secondary winding. The primary winding has fewer turns of wire and is connected to the vehicle's battery, while the secondary winding has many more turns and generates a high voltage when the primary circuit is interrupted. A transformer effect occurs due to the changing magnetic field, allowing the ignition coil to produce the high voltage needed to ignite the fuel-air mixture in the engine's cylinders. Finally, the coil is encased in a protective housing to ensure durability and reliability.