Which of the following is NOT a passive electrical component?

The transistor is not a passive electrical component because it is an active component that can amplify or switch electronic signals and electrical power. Unlike passive components such as resistors, capacitors, and inductors that don't require an external power source and don't generate energy, transistors require a power supply to function and actively control the flow of current. Transistors are essential in modern electronics for amplification, modulation, and digital switching applications, making them an active component within electronic circuits.