In the following circuit diagram, 5 identical electrical appliances rating "125W, 5V" are connected with the secondary coil of a 10:1 step down transformer. The current flowing through the primary coil of the transformer is 0.4A. Assume that there is no resistance in the coil. Q: What is the efficiency of the transformer? I will be highly grateful if u can show ur steps and explainations to me because the efficiency i got is over 100%! Thanks!