Question 389Electricity & Electronics - QMED
70% to passIf the illustrated device in figure "B" has a step-up ratio of 10 to 1 what voltage would be measured at the secondary shortly after the primary of the device is connected to 110 volts DC with a current of 12 amps? Illustration EL-0055
A0 volts
B110 volts
C1000 volts
D1100 volts
AI Explanation
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 for every 10 volts applied to the primary winding, the secondary winding will produce 1 volt. Since the primary is connected to 110 volts DC, the secondary voltage would be 110 / 10 = 11 volts DC. However, the question asks what the voltage would be "shortly after the primary of the device is connected to 110 volts DC". At the instant of connection, the secondary winding would have 0 volts, as the magnetic field in the transformer is just beginning to build up. Therefore, the correct answer is A) 0 volts.
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