Question

how can 3 resistors of resistance 3ohm so that the combination has a resistance of 1ohm and 2ohm​

Answer 1

if you put all of them in parallel, you get 1 ohm

put two of them in series and the third one as parallel to both of them, you'll get 2 ohm

;-)

Answer 2

1 ohm

1/3+1/3+1/3= 3/3= 1 ohm.

hence verified.

for 2 ohm

2 in series and one parallel to it.

3+3= 6 ohm(series).

6 ohm and 3 ohm parallel.

1/6+1/3 = 3/6= 1/2

equivalent resistance = 2 ohm.

hence verified.

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