An autotransformer is equipped with a 50% tap, a 65% tap, and an 80% tap. Which of the following statements is true concerning a load connected to the 50% tap?
⢠Autotransformer voltage ratios between line (full) voltage and a tapped portion (e.g., 50%) ⢠The relationship between voltage and current in a transformer for a given power (VA = volts à amps) ⢠How step-down voltage affects current on the load side compared with the line side
⢠If the load is connected to the 50% tap, what fraction of the line voltage does that load actually see? ⢠For an ideal transformer, when voltage goes down, what happens to current to keep power approximately constant? Does it go up, go down, or stay the same? ⢠Compare each answer choice: which one matches the expected tradeoff between voltage and current at a 50% tap?
⢠Confirm that 50% tap means the load is across half the winding, not the full line voltage ⢠Remember that in a transformer, power (VA) is approximately conserved: ( V_{primary} I_{primary} \approx V_{secondary} I_{secondary} ) ⢠Check that the option you pick has voltage and current changing in opposite directions in a way that keeps VA roughly the same (if one halves, the other should roughly double, and vice versa)
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