An electrical power line, having a total resistance of 2 Ω , delivers 1   kW at 220   V . The…

An electrical power line, having a total resistance of 2Ω, delivers 1 kW at 220 V. The efficiency of the transmission line is approximately :
  1. 72%
  2. 91%
  3. 85%
  4. 96%

Solution

i=PV=1000220

PR=i2R

η=1000×1001000+41.32=96%

Asked in: JEE Main 2020 (05 Sep Shift 1)

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