The 4200 volts produced by the microwave oven's power supply
can deliver over 1500 watts of unfiltered DC and is highly dangerous. It
can kill you instantly. The cannon appears to have been put together using a stick, a coffee
can, and of course, the cavity
magnetron with its attached power supply.
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The microwave oven uses a magnetron to generate microwave energy. The microwave energy travels through a waveguide and is distributed into a metal cavity where the food is cooked. The waves are absorbed by the food and excite water molecules in the food. This heat then transfers throughout the food cooking it.
