15.The primary circuit of a transformer has 120 coils and voltage of 60V. The secondary circuit has 160 coils and a current of 5.0A. What is the voltage of the secondary circuit?

17. A power plant produces 500 MW of power that is transmitted at a current of 20.0 kA. The resistance in the transmission wire is 0.20 ohms. Show how the percentage of power lost in the transmission line is 16%

18.Explain why high-voltage and low-current AC through the use of transformers provides the most efficient electrical energy transmission