# Which of the following expression is true in case of short circuit parameters?

Which of the following expression is true in case of short circuit parameters?

(a) I1 = Y11 V1 + Y12 V2

(b) I1 = Y11 I1 + Y12 V2

(c) V1 = Y11 I1 + Y12 V2

(d) V1 = Y11 V1 + Y12 V2

This question was posed to me in a job interview.

Question is from Short Circuit Admittance(Y) Parameters topic in portion Two-Port Networks of Network Theory

Select the correct answer from above options

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Correct choice is (a) I1 = Y11 V1 + Y12 V2

The best I can explain: The expression relating the short circuit parameters Y11, Y12 and  voltages V1, V2 and current is I1, is I1 = Y11 V1 + Y12 V2.