In an ideal transformer with a turns ratio of 1:2 (Np:Ns), the secondary voltage is what fraction of the primary voltage under ideal conditions?

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Prepare for the LADWP Electric Station Operator Test focusing on Circuit Breakers, Disconnects, and Transformers. Study with tailored questions and detailed explanations to enhance your knowledge and boost confidence. Ace your exam!

Multiple Choice

In an ideal transformer with a turns ratio of 1:2 (Np:Ns), the secondary voltage is what fraction of the primary voltage under ideal conditions?

Explanation:
In an ideal transformer, voltages scale with the turns on each winding. With a turns ratio of 1:2, the secondary has twice as many turns as the primary, so the secondary voltage is Vs = Vp × (Ns/Np) = Vp × 2. That means the secondary voltage is twice the primary voltage under ideal conditions. If you put 120 V on the primary, you’d see about 240 V on the secondary. The other fractions would only occur if the turns ratio were different (equal voltage would require equal turns; half would require Ns/Np = 0.5; one-third would be Ns/Np = 1/3).

In an ideal transformer, voltages scale with the turns on each winding. With a turns ratio of 1:2, the secondary has twice as many turns as the primary, so the secondary voltage is Vs = Vp × (Ns/Np) = Vp × 2. That means the secondary voltage is twice the primary voltage under ideal conditions. If you put 120 V on the primary, you’d see about 240 V on the secondary. The other fractions would only occur if the turns ratio were different (equal voltage would require equal turns; half would require Ns/Np = 0.5; one-third would be Ns/Np = 1/3).

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