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The variable resistor in the circuit in Fig. P4.89 is

Chapter 4, Problem 4.88

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QUESTION:

The variable resistor in the circuit in Fig. P4.89 is adjusted for maximum power transfer to R a) Find the numerical value of R b) Find the maximum power delivered to R c) How much power does the 180 V source deliver to the circuit when R is adjusted to the value found in (a)?

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QUESTION:

The variable resistor in the circuit in Fig. P4.89 is adjusted for maximum power transfer to R a) Find the numerical value of R b) Find the maximum power delivered to R c) How much power does the 180 V source deliver to the circuit when R is adjusted to the value found in (a)?

ANSWER:

Step 1 of 10

(a)

Open the resistor  and calculate the Thevenin’s equivalent across .

Circuit diagram:

Figure 1.

The current  (since the circuit is open).

Apply Kirchhoff’s current law at node voltage ,

                

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