A power transformer has a single primary...

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Question 1 of 20O6ZlmlIaWMYiTM2Nj4Jh

A power transformer has a single primary winding and three secondary windings producing 5.0 volts, 12.6 volts, and 150 volts. Assuming similar wire sizes, which of the three secondary windings will have the highest measured DC resistance?

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Question 1 of 20

O6ZlmlIaWMYiTM2Nj4Jh

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🔍 Key Concepts

• Relationship between number of turns, voltage, and length of wire in a transformer winding • How wire length affects electrical resistance when wire size (gauge) is the same • Which winding (low-voltage vs high-voltage) typically needs more turns on the core

💭 Think About

• If all windings use similar wire sizes, what factor is left that can change the resistance from one winding to another? • Which of the three voltages (5.0 V, 12.6 V, 150 V) would require the greatest number of turns on the transformer core, and how does that relate to resistance? • Think about which winding will have the longest total wire length and what that does to its DC resistance.

✅ Before You Answer

• Recall that for the same wire gauge, resistance increases with length of wire • Remember that transformer secondary voltage is roughly proportional to the number of turns on that winding • Identify which voltage output corresponds to the largest number of turns and therefore the longest wire and highest resistance

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