The ratio (R) of output resistance r₀, and the input resistance ri in measurements of input and output characteristics of a transistor is typically in the range:

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter transistor configuration is :

To get an output of 1 from the circuit shown in figure the input must be :

The truth table given in fig. represents :

A	B	Y
0	0	0
0	1	1
1	0	1
1	1	1