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# Consider a box with three terminals on top of it:

Question:

Consider a box with three terminals on top of it:

Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement. A student performs an experiment in which any two of these three terminals are connected in the circuit shown in the figure (b).

The student obtains graphs of current-voltage characteristics for an unknown combination of components between the two terminals connected in the circuit.

The graphs are

(i) when A is positive and B is negative

(ii) when A is negative and B is positive

(iii) When B is negative and C is positive

(iv) When B is positive and C is negative

(v) When A is positive and C is negative

(vi) When A is negative and C is positive

From these graphs of current-voltage characteristic shown in the figures, determine the arrangement of components between A, B and C.

Solution:

(a) A is connected to the n-side of the PN junction and B is connected to the top-side of pn junction.

(b) 0.7 V is the knee voltage.

(c) Pn junction is connected to C and n-side of pn junction to B and knee voltage is 0.7 V.

(d) The above conditions explains the connection of pn-junction along I and II with the resistance.