Answer :
Final answer:
The voltage sent to the step-up transformer, when 55% of the turns on the autotransformer are used, is 121 volts. Therefore the correct option is A.
Explanation:
The voltage sent to the step-up transformer can be calculated based on the percentage of the turns used on the autotransformer. Here, 55% of the turns are used. So, we take 55% of the incoming line voltage which is 220 volts. To determine this, we multiply 220 volts by 0.55 (which is the decimal equivalent of 55%). This gives a result of 121 volts. Thus, the voltage sent to the step-up transformer is 121 volts.
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