You are supplied with a number of 100 Ω resistors. How could you combine some of these resistors to make a 250 Ω resistor?

To make equivalent resistance of 250 ohms one may connect:

1) 2 resistors in series Thus, the resultant would be:


100+100= 200 ohms


2) 2 resistors in parallel Thus, the resultant of 2 parallel combination would be:



3) Now connect the combination of the two (series and parallel) in series: Thus, we may obtain a net resistance of: 200+50 = 250 ohms


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