Question

yyy pottential difference constant in parallel combination but not in series combination​

Answer 1

Explanation:

If you look at the parallel combination, Since the positive terminals of all the resistors are connected to the positive terminal of the battery and similarly the negatively terminal. So they will have same voltage unless any resistance is connected in any branch for which voltage drop may occur.

In a series circuit, the voltage gets divided by componets in the circuit. This is called voltage drop. In a parallel circuit the same voltage gets applied to the components. No voltage drop.