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Solved Problems-4

Problems-4
In the network shown, calculate the power input to each of the following elements when it is connected across A and B.
  1. a resistance RAB of 59 Ω.
  2. a voltage source of –160 V.
Description: 725.png
 
Solution
  1. Converting the two deltas into star,
Description: 4187.pngDescription: 4194.png,
Description: 6090.png
 
and Description: 4207.png
 
 
Description: 1724.png
 
 
∴ Description: 4213.png
 
Main current, Description: 4219.png
 
Current in 59Ω resistor, Description: 4228.png
 
Power input, Description: 4234.png 
  1. Description: 1750.png
By KVL,
 
Description: 4244.png
 
and Description: 4250.png
 
Solving, Description: 4256.png
 
Description: 4262.png
 
∴ Power input, Description: 4268.png
 




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