Good AC (alternating current): This is nearly constant voltage pure sine wave 115 v plus or minus 5 volts at 60 Hz for northern America. For other countries that use 220V and/or 50 Hz. The same concepts apply. The numbers for the voltage and frequency ranges proportionally changes.
Bad AC: This is modified sine wave or square wave and/or voltage fulgurations greater than 122 volts and less than 105 volts. It is also bad when the frequency is more than 20% variance from 60 Hz. Bad AC can cause electronics, tungsten, and florescent lighting to burn out.
How to make good AC out of Bad AC in a Primitive Environment
