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Calculate the maximum power delivered across RL of the circuit given.

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Calculate the maximum power delivered across RL of the circuit given.

(a) 900W

(b) 1025W

(c) 2025W

(d) 1500W

The question was posed to me during an internship interview.

This interesting question is from Maximum Power Transfer and Superposition topic in division Techniques of Circuit Analysis of Electric Circuits

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The correct choice is (c) 2025W

The explanation is: Pmax= (VTh/(RTh+RL))^2*RL   (RTh=RL)

  VTh= (150/150+30)*540= 450V

  RTh=(150*30)/180= 25Ω (the given resistors are in parallel).

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