21. total resistance in this circuit is determined by \n a r1 × r2 × r3 \n b (r1 × r2) + (r2 × r3) \n c…
21. total resistance in this circuit is determined by \n a r1 × r2 × r3 \n b (r1 × r2) + (r2 × r3) \n c $\frac{e_a}{r1 + r2 + r3}$ \n d r1 + r2 + r3
Answer
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