A car starter is responsible for turning over, or starting, a vehicle engine. Located on the underside of most cars, the starter is controlled by the solenoid, which is a small attachment directly on top of the starter itself. The solenoid, which receives electricity from the car battery, is responsible for engaging and disengaging the starter. A car starter has a small cogged wheel that engages and disengages with the engine flywheel, which is a large cogged wheel attached directly to the engine crankshaft. When a person turns the key in their car ignition, the solenoid receives electricity from the car battery and then engages the starter with the flywheel. The starter turns the flywheel which in turn turns the engine crankshaft, which in turn starts the motions of a running engine.