The ignition coil is the transformer that puts out the voltage required to make a spark jump the points of a spark plug. this in turn lights the petrol which pushed down the piston.
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Ignition or ignition switch could be bad or the selanoid could have went out
Toroidal coils as in ignition coils perform the same function as standard coils. The difference is that the magnetic fields are better focused and generally do not leak as much energy into the surrounding environment. Is there a difference in car performance? Very hard to say as generally stock ignitions these days (post 1990s) are excellent and do their job remarkably well.
on what kind of car
No gas Ridiculous...hoping that there is gas in your car...I would say either the starter or the ignition switch. When you get the car started, take it to autozone and let them do a free diagnostic on your alternator, battery, starter and ignition module.
The best answer is to follow the recommendations for maintenance in your particular car's owner's manual. A rule of thumb is every 30,000 miles for standard plugs and 60,000 for platinum or other precious metal plugs. Don't forget the ignition system's secondary wiring. Worn plugs and damaged wires can cause ignition coils and other ignition components to fail prematurely.