Question

1. total resistance in this circuit is determined by

a r1 × r2 × r3
b (r1 × r2) + (r2 × r3)
c $\frac{e_a}{r1 + r2 + r3}$
d r1 + r2 + r3

Explanation:

Step1: Identify circuit type

The given circuit is a series - circuit as the resistors R1, R2, and R3 are connected one after the other in a single path.

Step2: Recall series - resistance formula

For resistors in series, the total resistance $R_{total}$ is the sum of the individual resistances. That is $R_{total}=R1 + R2+R3$.

Answer:

D. R1 + R2 + R3