P 3.6-7 Determine the value of the resistance R in Figure P 3.6-7.

Answer: R = 28 kΩ

 

Figure P 3.6-7

 

R is in parallel with 21 k so the effective resistance is

 

 

This is in series with the 12 k so the total circuit resistance is

 

 

Now Ohm’s law gives us

 

Solve for R

 

 

 

 

 

 

 

 

 

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This page last updated on January 20, 2019