Identify the correct combination for a step-down transformer.(a) k Vp, Is > Ip, Ns 1; Vs Ip, Ns > Np(c) k > 1; Vs > Vp, Is Np(d) k Ip, Ns < NpThe question was asked in semester exam.Enquiry is from Alternating Current in division Alternating Current of Physics – Class 12

Identify the correct combination for a step-down transformer.(a) k < 1

1.	Identify the correct combination for a step-down transformer.(a) k < 1; Vs > Vp, Is > Ip, Ns < Np(b) k > 1; Vs < Vp, Is > Ip, Ns > Np(c) k > 1; Vs > Vp, Is < Ip, Ns > Np(d) k < 1; Vs < Vp, Is > Ip, Ns < NpThe question was asked in semester exam.Enquiry is from Alternating Current in division Alternating Current of Physics – Class 12
Answer» The correct option is (d) k < 1; Vs < Vp, Is > Ip, Ns < Np The EXPLANATION is: For a step-down transformer, the voltage at the second terminal is lesser than the primary terminal, i.e. ➔ Vs < Vp. Similarly, the NUMBER of turns in the secondary WINDING is lesser than that in the primary winding, i.e. ➔ Ns < Np. Also, the current in the secondary COIL is greater than that current flowing the primary coil, i.e. ➔ Is > Ip. So the TRANSFORMATION ratio will be lesser than 1. So, the correct combination is given as: k < 1; Vs < Vp, Is > Ip, Ns < Np

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