Back to Series Circuits — Problem 5 · Task Set 9

Exercises: Series Circuits

Work through each section in order. Show all steps: find R_eq, then I, then each voltage drop, then verify with KVL.

Grade 11·21 problems·~30 min·OpenStax Physics (High School)·section·sec-19-2

Work through problems with immediate feedback

Fluency Practice

In the same series circuit ( $R_1 = 10\ \Omega$ , $R_2 = 20\ \Omega$ , $R_3 = 30\ \Omega$ , $I = 0.20\ \text{A}$ ), what is the KVL check result: do the voltage drops across all three resistors sum to $V_{source} = 12\ \text{V}$ ?

Yes: $V_1 + V_2 + V_3 = 2 + 4 + 6 = 12\ \text{V}$ ✓

No: the drops sum to $6\ \text{V}$ , only half the source.

No: the drops cannot be calculated from the current and resistances.

Yes, but only because this is a simple circuit — KVL doesn't apply in general.