Is amplified by a "factor of A" correct?

Question

I was reading about electronics and amplification and I wonder if it correct to say

the signal is amplified by a factor of A

A represents a number here.

Answer 1

Yes, that's correct. In electronics, you'll likely see it expressed in decibels (dB), but either way works:

The signal was amplified by 3dB.

The signal was amplified by a factor of 2.