which device involves the use of plasma in technology?\narc welder\ndiesel engine\na car radio\nbattery…

Brief Explanations:

Plasma is a high - energy state of matter. Arc welders create an electric arc between an electrode and the workpiece. This arc ionizes the gas around it, creating plasma which provides high heat for welding. Diesel engines work on the principle of combustion of diesel fuel, car radios use electromagnetic waves for signal reception, and battery - operated flashlights convert chemical energy to light energy. None of these involve plasma.

Answer:

arc welder