Which of these amplifiers provides a high input resistance and a variable gain?
A)open-loop amp
B)non-inverting amp with a rheostat as Rf.
C)inverting amp
D)voltage-follower amp

Question

Quizplus · Accepted Answer

A non-inverting amplifier with a rheostat as Rf allows for variable gain while maintaining high input resistance, as the input is connected directly to the non-inverting terminal.

Which of These Amplifiers Provides a High Input Resistance and a Variable