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what is common collector
Common collector amplifier can be used as a voltage buffer and in impedance matching
emitter follwer
current gain
A: Because it is a voltage amplifier the current will inversely reflect the voltage across a resistor
becoz it gives good gain which is necessary for an amplifier.
No voltage gain
Current gain. At the cost of no voltage gain.
it is a mechanism applied in an amplifier so as to raise it's input impedance.Mostly this mechanism is applied in a common collector(emitter follower) amplifier.
the common collector can use as voltage buffer
Common-emitter gives more voltage gain because a common-collector amplifier has a voltage gain of 1. But a common-collector can have a power gain because the input impedance is much more than the output impedance.
no phase shift