Question

A transistor can be used as

Answer 1

A transistor can be utilized as a switch for opening and closing the circuit. A transistor is utilized as an oscillator for the production of continuous undamped oscillations of any desired frequencies. A transistor can also operate as an amplifier. It is applied as an amplifier to raise the strength of a weak signal. A transistor can also be applied as an inverter for changing dc into ac. Bipolar Junction Transistor (BJT), Gate-Turn-Off Thyristor (GTO), and Field-Effect Transistor (FET) are utilized for the conversion.

Complete step-by-step solution:
Following are how a transistor can be used as:
Transistor as a switch: It is a solid-state switching with exceptional reliability and lesser cost. NPN and PNP transistors are utilized as switches. Utilizing a transistor as a switch is the most accessible application of the device. A transistor can be extensively utilized for switching operation, either for the availability or closing of a circuit. Meanwhile, the fundamental concept behind the work of a transistor as a switch relies on its mode of operation. Generally, the low voltage DC is turned on or off by transistors in this mode.
Transistor as an amplifier: It raises the power of a weak signal. The DC bias voltage implemented to the emitter-base junction creates it remain in forwarding biased condition. This forward bias is kept regardless of the polarity of the signal.
Transistor as an oscillator: A transistor can be worked as an oscillator to provide continuous undamped oscillations of any wanted frequency if the tank and feedback circuits are property combined. All oscillators under various names have similar functions, i.e., they produce continuous undamped output.
Transistor as an inverter: For inverter performance, the power switching tools must have the capacity to hold off forward voltage, and the interval of the period when conduction happens must be controllable. The simplest inverters utilize switching devices that can prevent the flow of current. Presently, such inverters use the bipolar junction transistor (BJT), the field-effect transistor (FET), or the gate-turn-off thyristor (GTO).

Note: A transistor is applied to amplify or switch electronic signals and electric power. It is formed of semiconductor material, usually with at least three ends connecting to an external circuit. A voltage or current utilized to one pair of the transistor's terminals regulates the current through another set of terminals. A transistor can magnify a signal because the controlled (output) power can be higher than the controlling (input) power.