11 kW of electric power can be transmitted to a distant station at (i) 220 V (ii) 22000 V. Which of the two transmission modes be preferred and why ? Support your answer with calculations.

11 kW of electric power can be transmitted to a distant station at (i)

1.	11 kW of electric power can be transmitted to a distant station at (i) 220 V (ii) 22000 V. Which of the two transmission modes be preferred and why ? Support your answer with calculations.
Answer» Here, `E_(p) xx I_(p) = 11 kW = 11000 W` (i) When power is transmitted at `E_(s) = 220 V` `I_(s) = (E_(p) I_(p))/( E_(s)) = (11000)/(220) = 50 A` Energy lost a heat `= I_(s)^(2) R = (50)^(2) R` `= 2500 R` watt (ii) When power is transmitted at `E_(s) = 22000 V` `I_(s) = (E_(p) I_(p))/(E_(s)) = (11000)/(22000) = 0.5 A` Energy lost as heat `= I_(s)^(2) = (0.5)^(2) R = 0.25 R` watt which is much less than energy loss in case (i). Therefore, power transmission should be done at 22000 V.

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11 kW of electric power can be transmitted to a distant station at (i) 220 V (ii) 22000 V. Which of the two transmission modes be preferred and why ? Support your answer with calculations.

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