i am aarthi .
I have doubts in these questions .
 
1 . Three resistors each of 2 ohms are connected together , so that their resistance is 3 ohms . draw a diagram to show this arrangment and check it by calculation .
 
 
2 .  when two resistors of resistance R1 and R2 are connected in parallel , the net resistance is 3 ohms . when connected in series its value is 10 ohms . calculate the values of R1 and R2 .

Asked by palani002001 | 25th May, 2015, 01:01: PM

Expert Answer:

1. R1 = R2 = R3 = 2 Ω
 
The resultant resistance is 3 Ω. Hence, the combination will be 2 resistors in parallel and their combination in series with the third.
 
 
The resistance between A and B is 
 
begin mathsize 14px style 1 over straight R subscript straight s equals 1 over straight R subscript 1 plus 1 over straight R subscript 2 equals 1 half plus 1 half equals 1 therefore straight R subscript straight s equals 1 space straight capital omega end style
 
 
This is in series with R3. So, we get
 
R = Rs + R3 = 1 + 2 = 3 Ω
 
NOTE: Kindly post the other question as a separate query.

Answered by Romal Bhansali | 26th May, 2015, 01:49: PM