[amp_mcq option1=”Emit light” option2=”Amplify weak signals” option3=”Regulate voltage” option4=”Rectify line voltage E. None of the above” correct=”option1″]
The correct answer is: Amplify weak signals.
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.
Transistors are used in almost all modern electronic equipment, and are the fundamental building blocks of modern computers, digital electronics, and telecommunications.
- Option A: Emit light. This is not one of the important things that transistors do. Transistors can be used to create light-emitting diodes (LEDs), but this is not their primary function.
- Option B: Amplify weak signals. This is one of the important things that transistors do. Transistors can be used to amplify weak signals by a large factor. This is why they are used in many electronic devices, such as amplifiers, radios, and televisions.
- Option C: Regulate voltage. This is not one of the important things that transistors do. Transistors can be used to regulate voltage, but this is not their primary function. There are other devices that are better suited for this purpose, such as voltage regulators.
- Option D: Rectify line voltage. This is not one of the important things that transistors do. Transistors can be used to rectify line voltage, but this is not their primary function. There are other devices that are better suited for this purpose, such as rectifier diodes.
- Option E: None of the above. This is not the correct answer. The correct answer is: Amplify weak signals.