Hey everyone, I had a question on a question about transformers: The primary coil of a transformer contains 100 turns; the secondary has 200 turns. The primary coil is connected to a size AA battery that supplies a constant voltage of 1.5 volts. What voltage would be measured across the secondary coil? So, I figured V_2/V_1 = N_2/N_1, where N = the number of coils and V = the volt. This led me to an answer of 3V, which is incorrect. Can someone explain why this is so? The question says the voltage is constant, so shouldn't the formula work?