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An electrical power line, having a total resistance of 2Ω, delivers 1 kW at 220 V. The efficiency of the transmission line is approximate:

 
Physics
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19/09/2020 11:40 am
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aditi07 
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An electrical power line, having a total resistance of 2Ω, delivers 1 kW at 220 V. The efficiency of the transmission line is approximate:

(1) 85%

(2) 91%

(3) 96%

(4) 72%

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19/09/2020 11:42 am
nikhil04 
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(3) 96%

Explanation:

i = P/V = 1000/220

PR = (i2)R

η = 1000 x 100/1000 + 41.32

= 96%

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