# Electric Current

1. May 13, 2006

### annaka

Can anyone explain the concept of effective resistance between two points in a circuit. There are , on an average 6-7 resistors connected in every possible way in between the 2 points
for exampe refer to H C Verma questions
same for potential difference

2. May 13, 2006

### Staff: Mentor

Imagine that between those two points there is a voltage drop V and thus a total current I. The effective resistance is R = V/I. (In other words, for the purpose of seeing how that pile of resistors affects the rest of the circuit it connects to, you can replace those resistors with a single resistor of size V/I.)

For simple combinations of resistors it's easy to find the effective resistance. For example, two resistors in parallel (R1 & R2) have an effective resistance of R where 1/R = 1/R1 + 1/R2.

3. May 14, 2006

### maverick280857

Hello

I would just like to add that Dr. HC Verma's book is common only in our country and I doubt if non-Indian forum users would be familiar with it. Hence if you are asking for help from a book published in India, please reproduce the exact question rather than referring to it. This helps people help you

Cheers
Vivek