Question

A vacuum tube can be used to__. A. change alternating current into direct current B. increase the strength of a signal.. C. turn a current on or off D. all of the above

Answer 1

Option (D) is correct. All of the above options are correct.

Further Explanation:

If two electrodes are inserted inside a vacuum tube under the proper physical condition then the complete system can behave as a rectifier which can be used to convert the alternating current into the direct current.

One can also insert a controller grid inside the vacuum tube which can easily control the strength of the signal passed through it and also help in increasing the strength of the signal

Whereas on the other hand a vacuum tube considered as a bad conductor and therefore, it the current passed through a vacuum area, then the current flow in the region will be hindered and therefore, the vacuum tube can be used as a switch to turn on and off the current.

Therefore, the above explanations suggest that all of the options are correct.

Thus, Option (D) is correct. All of the above options are correct.

Learn More:

1. How is the power defined brainly.com/question/911620

2. Which of the following statements about electromagnetic radiation are true brainly.com/question/1619496

3. What evidence is there that electrons move around in definite pathways around the nucleus brainly.com/question/2927304

Answer Details:

Grade: High School

Subject: Physics

Chapter: Current Electricity

Keywords:

Vacuum tube, change alternating current, direct current, strength of signal, turn on and off, bad conductor, electrodes in vacuum chamber.

Answer 2

The correct answer of this question is :  A) Change alternating current into direct current.

EXPLANATION :

As per the question, we are given vacuum tube. Vacuum tube can be of various types. Normally it contains two electrodes called cathode and anode which are enclosed in an evacuated glass chamber . There are also other types of vacuum tubes which contain extra electrodes like control grid .

The vacuum tube can be used as a rectifier. It means that it can be used as an electronic device which will convert alternating current into direct current. It may be a half wave rectifier or a full wave rectifier. Actually the direct current obtained during the rectification of alternating current is pulsating in nature.

Hence, the correct answer is that a vacuum tube can be used to change alternating current into direct current.