If a transformer is supplied with 16 volts and 4 amperes, the output current from this transformer with an output voltage of 1200 volts would be
A)24 volts.
B)0.02 amperes.
C)480 amperes.
D)800 amperes.

Question

Quizplus · Accepted Answer

The output current of a transformer is related to the input and output voltages and the turns ratio of the transformer. In this case, the turns ratio can't be determined, so we have to assume it's ideal (i.e., there are no losses in the transformer). 
The equation for the ideal transformer is:
V_in / V_out = N_in / N_out, where N is the number of turns in the input and output coils. 
So, if the input voltage is 16 volts and the output voltage is 1200 volts, the turns ratio is 1200/16 = 75. 
Since the transformer is ideal, the input power equals the output power:
V_in x I_in = V_out x I_out
Plugging in the known values, we get:
16V x 4A = 1200V x I_out
I_out = (16V x 4A) / 1200V = 0.053A or 0.02A, rounded to two significant figures. Therefore, the correct answer is B, 0.02 amperes.

If a Transformer Is Supplied with 16 Volts and 4