Once I put my key in the ignition and turn the car on what are the sequence of events that take place?
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When you turn your key to the start position it completes a circuit with the starter. The starter moves a little gear into place to match up with a very big gear that is attached to the spinning parts of your engine. The starter will use electricity from the battery to spin the big gear, starting the process of your engine moving. Once the engine parts are moving, igniting gasoline can take over the process to keep the engine moving.
If you have accidentally turned the car over while it was already running that awful noise is from the starter trying to move the little gear into the big gear, but the big gear is already spinning.
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