When there are two parallel resistances and they are not equal, it is usually quicker to calculate the combined resistance by finding their sum and dividing that by their product.

Question

Quizplus · Accepted Answer

The correct formula for calculating the combined resistance of two parallel resistances (R1 and R2) is the product of their resistances divided by the sum, not the other way around. The formula is $R_{total} = \frac{R1 \times R2}{R1 + R2}$.

When There Are Two Parallel Resistances and They Are Not