Question 14Electricity & Electronics - Assistant Engineer

The correct answer is A) 0 volts. The question states that the illustrated device in figure "B" has a step-up ratio of 10 to 1. This means that the voltage at the secondary will be 10 times the voltage at the primary. Since the primary is connected to 110 volts DC, the voltage at the secondary should be 1100 volts. However, the question also states that the primary current has stabilized at 12 amps. This indicates that the device is a transformer, and when a transformer's secondary is left open-circuited, the voltage at the secondary is 0 volts. The other answer choices are incorrect because they do not reflect the behavior of a transformer with an open-circuited secondary.