For a transformer with primary turns 400, secondary turns 100, if 20A current is flowing through primary, we will get ___________ a) 80A at secondary b) 5A at secondary c) 800A at secondary d) 40A at secondary

imer Notes EV A transformer has 400 primary, and 80 secondary, turns. If an alternating potential of 250 V is applied to the primary, what potential is produced across the secondary? V

The switch in the circuit shown is closed at time t = 0. a) At what rate is energy being dissipated asheat in the resistor after an elapsed time equal to the time constant of the circuit? b) Calculate the rate at whichenergy is being stored in the inductor at this time. c) What is the total energy stored in the inductor at this time?d) How long a time does it take the current to reach 70 percent of its maximum value?

Can you help with 5a and subquestion 5b 5a. An American traveler in Australia carries a transformer to convert Australia’s standard 230 V to 115 V so that she can use some small appliances on her trip. What is the ratio of turns in the primary and secondary coils of her transformer? 5b. What is the ratio of input to output current? (How could a Australian traveling in the United States use this same transformer to power her 230 V appliances from 115 V?) This is not and will not be graded