- #1

k_squared

- 64

- 0

## Homework Statement

I was reading in my physics book about loop currents. However, some resistors are added to the result (R*I) whereas some resistors are subtracted from the result -(R*I). The book uses the phrase "uphill" and "downhill" to describe this, and, indeed, the so called "uphill" resistors where the values are added instead of subtracted the chosen current was headed north as it passed through them, but I doubt that can be the rule.

My answer, however, is WHY does this work? Is it not possible to construct a circuit where the resistor could be on either side of the loop (like a circuit with only one loop, a battery and two resistors?)

So how do we know whether to add or subtract resistors?

## Homework Equations

(N/A)

## The Attempt at a Solution

(see above.)[/B]