To determine the equivalent resistance of a series combination of two resistors r1 and r2, a student arranges the following setup. Which of the following statements will be true for these circuits?
1) The total resistance will be equal to the sum of r1 and r2.
2) The total resistance will be equal to the product of r1 and r2.
3) The total resistance will be equal to the difference of r1 and r2.
4) The total resistance will be equal to the ratio of r1 and r2.
