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Three resistors R1 = 1.0 ohm, R2 = 6.0 ohm, and R3 = 13 ohm are connected one after the other across a 12 V battery. What is the equivalent resistance of the combination?
A78 ohm
B0.42 ohm
C13 ohm
D20 ohm
Answer & Solution
Correct answer: D. 20 ohm
1. For resistors connected one after the other, the equivalent resistance is the sum of the individual resistances.
2. R_equiv = R1 + R2 + R3 = 1.0 ohm + 6.0 ohm + 13 ohm.
3. R_equiv = 20 ohm.
_Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section Calculation of Equivalent Resistance_
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