A 20-ohm resistor is connected in parallel with a variable resistor R. The parallel combination is then connected in series with a 4-ohm resistor and connected across a 240 V source. Determine the minimum value of R if the power of R is equal to the power taken by the 4-ohm resistor.

A 20-ohm resistor is connected in parallel with a variable resistor R. The parallel combination is then connected in series with a 4-ohm resistor and connected across a 240 V source. Determine the minimum value of R if the power of R is equal to the power taken by the 4-ohm resistor.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter17: Resistive-inductive Series Circuits

Section: Chapter Questions

Problem 16PP: An R-L series circuit contains two resistors and two inductors. The resistors are 86 k and 68 k ....

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Question

A 20-ohm resistor is connected in parallel with a variable resistor R. The parallel combination is then
connected in series with a 4-ohm resistor and connected across a 240 V source. Determine the
minimum value of Rif the power of R is equal to the power taken by the 4-ohm resistor.

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