# Electronics - Bipolar Junction Transistors (BJT) - Discussion

### Discussion :: Bipolar Junction Transistors (BJT) - General Questions (Q.No.13)

13.

A transistor may be used as a switching device or as a:

 [A]. fixed resistor [B]. tuning device [C]. rectifier [D]. variable resistor

Explanation:

No answer description available for this question.

 Girish said: (Jan 8, 2011) by transistor current can be vary so resistance can also varies by increasing or decreasing the battery voltage

 Boopathi . S said: (Jun 27, 2011) TRANSICTOR MEANS TRANSFER RESISTOR , IN A TRANSISTOR I/P SIGNAL IS GIVEN TO LOW RESISTANCE PATH , O/P IS TAKEN FROM HIGH RESISTANCE SIDE ,SO RESISTANCE IS VARIABLE IN TRANSISTOR .

 Ram said: (Apr 22, 2013) We can change the o/p current by changing the i/p resistance so transistor is used as a variable resister.

 Mandeep Singh Saini said: (May 19, 2014) Case 1: If transistor is in OFF condition collector current is High. output voltage Vo = logic 1 = Zero or Min resistance path. Case 2: If transistor is in ON condition collector current Ic is LOW.because (Ic =Ib+Ie) total current goes to emitter terminal or ground. So output voltage Vo=logic 0 = Max resistance path. Both cases resistance is variable Min(0) to Max(1).

 Anomieee said: (May 30, 2019) Transistor is itself a transfer of resistance (trans-istor means trans-resistor named by it). Base or input side high to output side is low resistance offered.

 Kaka Raj said: (Feb 18, 2021) @MANDEEP SINGH: The basic formula is IE=IB+IC.