Magnetron: The silver box with cooling fins that generates the electromagnetic waves to heat food.High Voltage Transformer: The large, heavy block that steps up standard voltage to approximately 2,000V AC to power the magnetron.High Voltage Capacitor: Often stores a charge of nearly 4,000V to 5,000V DC and must be discharged safely before touching any internal parts.Cooling Fan: Regulates component temperatures and removes steam from the cavity.