Question

Thy do stars shine? > Online quiz 5: Friday 2 PM Ruigi Pang Question 1 Not complete Marked out of 4.00 P Flag question Question: Low power applications in the home often have a transformer that plugs into the 240 V AC wall socket and a lead taking low voltage power to the appliance. (Often the plug-in unit includes an AC-DC converter, but that doesn't concern us for this problem.) Part 1) For a device requiring V 18 V AC, if the primary winding has n-370 turns, how many windings does the secondary coll have assuming an ideal transformer? Secondary has turns Part 2) If the AC power of the device is P - 35 W, what is the current drawn from the 240 V supply? Current = Part 3) What is the current output from the transformer? Current = Check A O BE e 2019/11/22

Answer 1

Part (1) Since, Vis NS Mea Vs NP = 180 X 370 turing. Ng = 27.75 turns .../Ng~ 28 turns | Part (2) For Ideal 240) For Ideal transformer Power supplied, Papp =Ps lil, P= V( Is = Vp Ip. i 35 = (240) Ip. => Ip = (35.) A = 0.146 volts Ip=0,146 volt! Output current from transformer, Is = 35 A Iszlegum Part (3)