In this video, a small alternator is tested to see how much power it can output with a maximum current limited to 100 Amps:

1. An alternator dynamometer test is performed to measure the net mechanical output power of an alternator converted to a motor.
2. The alternator on the right has been converted to a motor. This is the same alternator (Chevrolet Camaro) as in the first video.
3. The alternator on the left is used as a conventional alternator to generate electricity.
4. The alternator motor on the right drives the conventional alternator on the left (belt drive), which generates electricity. The alternator on the left loads down the alternator on the right by acting as a dynamometer load ("Dyno") by generating electricity which is dissipated in a resistive electrical test load.
5. The sequence in this video:
   1. Video starts by showing alternator converted to motor (right side) running at 5200 RPM with no load.
   2. Next, the load is increased to 2.8 HP in 3 steps, then back to light load in 3 steps. (Again, the load is provided by the conventional alternator on the left generating electricity.)
   3. Next, the load is abruptly raised from zero (no load) to 2.8 HP. The alternator speed drops from 5200 RPM to 2800 RPM from this load. The alternator speed drops because the current is limited to 100 Amps by the power source (inverter).
   4. Next, the 2.8 HP load is abruptly removed, and the speed increases from 2800 RPM to 5200 RPM.
   5. This sequence is repeated one more time.