What is the difference between the starter and the generator in an engine's electrical system?

What is the difference between the starter and the generator in an engine's electrical system?

• A. The starter stores energy and the generator consumes energy
• B. The starter and generator perform the same function
• C. The starter charges the battery, generator starts the engine
• D. The starter provides initial rotation using electrical power; the generator (or alternator) supplies power and recharges the battery when running

Answer: (D)

The key idea is that starting and running the engine rely on different electrical roles. The starter uses electrical power from the battery to turn the engine over, spinning the crankshaft until ignition occurs and the engine runs on its own. Once the engine is self-sustaining, the starter is disengaged. The generator (often an alternator) then provides electrical power to the aircraft systems and recharges the battery while the engine is running, converting mechanical energy into electrical energy and maintaining the battery voltage with regulation. So, the starter’s job is to provide initial rotation, and the generator’s job is to supply power and keep the battery charged during operation.

The key idea is that starting and running the engine rely on different electrical roles. The starter uses electrical power from the battery to turn the engine over, spinning the crankshaft until ignition occurs and the engine runs on its own. Once the engine is self-sustaining, the starter is disengaged. The generator (often an alternator) then provides electrical power to the aircraft systems and recharges the battery while the engine is running, converting mechanical energy into electrical energy and maintaining the battery voltage with regulation. So, the starter’s job is to provide initial rotation, and the generator’s job is to supply power and keep the battery charged during operation.