hn • r/hackernews
Comment on: Why Airplanes Use 400 Hz Power
A transformer works on A/C only, for one thing by being electromagnetically sensitive to the cyclic reversal of incoming voltage.The higher the number of windings in the coil, and/or the amount of iron in the core, the greater the impedance to this constant polarity reversal. And the more sensitive to the lower frequencies.These are basically audio frequencies and the inductance presented by the transformer's primary winding acts almost as a low-pass filter whose effectiveness changes rapidly as frequency approaches zero. IOW a small transformer doesn't have as much frequency response to the