Which of the following statements are correct for a transistor action?

(A) The input resistance depends upon the current I in the transistor
(B) Collector currents is equal to the sum of base current and emitter current
(C) The emitter junction is forward biased
(D) The collector junction is reverse biased
(E) Both the emitter junction as well as the collector junction are forward biased

Choose the correct answer from the options given below:

(A) and (C) only

The correct answer is Option (4) → (A) and (C) only

(A) True, The input resistance of a transistor (especially in a common-emitter configuration) depends on the current flowing through the transistor. As the input current (base current) changes, the impedance changes due to behaviour of the transistor characteristic curves.

(C) True, In a transistor (whether MPN or PNP), the emitter junction (between the base and the emitter) is always forward biased to allow the flow of charge carriers from emitter into the base.