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A circuit shown in Fig. 3.53 has resistances R1 = 20 Ω and R2 = 30 Ω. At what value of the resistance

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A circuit shown in Fig. 3.53 has resistances R1 = 20 Ω and R2 = 30 Ω. At what value of the resistance Rx will the thermal power generated in it be practically independent of small variations of that resistance? The voltage between the points A and B is supposed to be constant in this case.

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Now, thermal power generated in the resistance Rx,

For P to be independent of Rx ,

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