Is it true or false that AC ripple in a healthy automotive alternator is highest at idle RPM?

In a healthy automotive alternator, AC ripple is not highest at idle RPM. The correct understanding is that AC ripple voltage tends to be more significant at higher RPMs due to the alternator's design and operation.

As the vehicle accelerates, the rotor spins faster, leading to increased output voltage and enhanced rectification of the alternating current produced by the alternator. At idle, the alternator operates at lower RPMs, which typically results in lower AC ripple voltage. Additionally, the components within the alternator, such as the diodes and voltage regulator, work more effectively to reduce ripple at higher RPMs where they can handle the load better.

This principle applies generally to the operation of typical automotive alternators, which are designed to function efficiently under various operating conditions, emphasizing that idle RPM does not coincide with the maximum AC ripple conditions.