In an electric circuit shown in the figure, the external resistance R is variable. It is found that same power is developed in external resistance R if its value is either 5  Ω  or  20  Ω.  With this information find the internal resistance (r) of the voltage source.

In an electric circuit shown in the figure, the external resistance R is variable. It is found that same power is developed in external resistance R if its value is either 5  Ω  or  20  Ω.  With this information find the internal resistance (r) of the voltage source.

  1. A

    20  Ω

  2. B

    8  Ω

  3. C

    103  Ω

  4. D

    10  Ω

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    Solution:

    I=   ER+r,  P=I2R=E2RR+r2Now  P1=P2  E255+r2=  E22020+r2r=10Ω

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