- #1

Genericcoder

- 131

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Hi I am little confused by star resistors configuration. The problem is asking for equivalent resistor for the circuit. I have attached the image below (Image is little sloppy because I can't draw with a mouse :D).

My logic is as follows:

First I calculated R1 and R2 as parallel resistors.

Req1 = (1/R2 + 1/R1)^-1

Req1 = 11.25;

Then I calculated that value in series with 4.5 resistor.

Req2 = 11.25 + 4.5 = 15.75;

Since, Req2 is parrallel with R4 then they should also add reciprocally.

Rt = (1/R4 + 1/Req2)^-1 = 6.81;

This value is wrong though I don't know what I did wrong.

Thanks for help in advance.

My logic is as follows:

First I calculated R1 and R2 as parallel resistors.

Req1 = (1/R2 + 1/R1)^-1

Req1 = 11.25;

Then I calculated that value in series with 4.5 resistor.

Req2 = 11.25 + 4.5 = 15.75;

Since, Req2 is parrallel with R4 then they should also add reciprocally.

Rt = (1/R4 + 1/Req2)^-1 = 6.81;

This value is wrong though I don't know what I did wrong.

Thanks for help in advance.