Step-down transformers are used to decrease or step-down voltage. These are used when voltage ne...

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Step-down transformers are used to decrease or step-down voltage. These are used when voltage need to be lowered for use in homes and factories.
A small town with a demand of \( 800 \mathrm{~kW} \) of electric power at \( 220 \mathrm{~V} \) is situated \( 15 \mathrm{~km} \) away from an electric plant generating power at 440 V. The resistance of the two wire line carrying is \( 0.5 \Omega \) per \( \mathrm{km} \). The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

The total value of voltage transmitted from the plant is:
(A) \( 500 \mathrm{~V} \)
(B) \( 4000 \mathrm{~V} \)
(C) \( 3000 \mathrm{~V} \)
(D) \( 7000 \mathrm{~V} \)
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