A transformer has 100 turns in the primary coil and 500 turns in the secondary coil. If the input voltage is 220 V, what is the output voltage?
Correct: B
The transformer equation is Vp/Vs = Np/Ns, where Vp and Vs are the primary and secondary voltages, and Np and Ns are the number of turns in the primary and secondary coils. So, 220/Vs = 100/500. Thus, Vs = 220 * (500/100) = 220 * 5 = 1100 V.