The voltage follower is a full negative feedback amplifier, the feedback coefficient is 1, the feedback form is voltage series negative feedback, and the voltage amplification is less than 1.
The current amplification effect of the op amp voltage follower can not be simply understood as \"amplification\".
In fact, the voltage follower is also a voltage amplifier with a gain of 1. Its function is impedance transformation, that is, a low impedance input is changed into a high impedance input. Because the low impedance input to get a certain voltage value must increase the current of the signal source, and the high impedance input of the amplifier basically does not absorb current, relatively speaking, there is current amplification.