Question

when the feedback energy (voltage or current) is so applied that it decrease the input energy i.e., it is out of phase with the input it is called
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Answer 1

Answer:

Positive feedback

Explanation:

The feedback in which the feedback energy i.e., either voltage or current is in phase with the input signal and thus aids it is called as Positive feedback.

Answer 2

Given:

When the feedback energy (voltage or current) is so applied that it decrease the input energy i.e., it is out of phase with the input.

To Find:

It is called?

Solution:

since, we know that ,

• Positive feedback is the feedback energy (voltage or current) is in same phase with the provided input signal. It increases the gain.

• Negative feedback is the feedback energy (voltage or current) is in opposite or out of  phase with the provided input signal. It reduces the gain.

• Feedback system is very useful and widely used in amplifier and oscillator.

here, it is given that, when the feedback energy (voltage or current) is so applied that it decrease the input energy i.e., it is out of phase with the input.

from above points, we conclude that-

⇒ It decreases the gain as decrease in input energy.

⇒ It is negative feedback.