Transistors are used in all of the following applications except:

Transistors are semiconductor devices that act as switches or amplifiers and are integral components in various electronic applications. Options like radio, television, and computer memory chips all utilize transistors for their functionality. In radios, transistors amplify sound signals; in televisions, they modulate and amplify both audio and visual signals; and in computer memory chips, transistors serve as the fundamental building blocks that store data by representing binary information (0s and 1s).

However, light bulbs operate based on the principles of electrical conduction and often function through resistance rather than the switching capabilities of transistors. Traditional incandescent light bulbs, for example, use a filament that heats up to produce light when electricity passes through it. While the use of smart light bulbs may incorporate transistors for control mechanisms, standard light bulbs do not inherently rely on transistors for their basic operation. Therefore, they are not classified within the category of applications that directly utilize transistors.