I HAD UNDERSTOOD HOW TO FIND "R" (EQUIVALENT)TOTAL BY YOUR ANSWER BUT I AM HAVING TROUBLE IN UNDERSTANDING THAT HOW TO DISTRIBUTE "+"AND "-" SIGNS IN RESISTORS CORRECTLY IN AN ELECTRIC CIRCUIT.CAN YOU EXPLAIN HOW YOU HAD DISTRIBUTED "+"AND "-" SIGNS IN RESISTORS IN THIS QUESTION TO IDENTIFY PARALLEL AND SERIES COMBINATIONS OF RESISTORS?

Asked by abinash.gupta003 | 26th Jun, 2017, 04:17: PM

Expert Answer:

 
- Based on your previous query, if the polarity of point A and B are not given in the question, we assume point A to be positive and point B to be negative.
- From point A, two wires i.e XC and XD originate, as point A is positive, the immidiate end of the resistors of point XC and XD will also be positive. And the other end of that resistor will be negative.
- Similarly, from point B, YC and YD originate, as point B is negative, the immidiate end of the resistors of point YC and YD will also be negaitive. And the other end of that resistor will be positive.
- We then deduce that if two or more resistors are connected at the ends having same polarity, they form a parallel combination whereas if they are connected at the ends back to back having opposite polarity, they form a series combination of resistors. 

Answered by Abhijeet Mishra | 27th Jun, 2017, 10:10: AM

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