Equivalent resistance in parallel
What is the equivalent resistance of a 3 Ω resistor and a 6 Ω resistor connected in parallel?
Answer A: explanation for every choice
A
Correct. 1/R = 1/3 + 1/6 = 1/2, so R = 2 Ω.
B
This averages the two resistances.
C
This is the series combination.
D
This is the product of the resistances, without dividing by their sum.
TakeawayIn parallel, 1/R = 1/R₁ + 1/R₂, and the result is less than the smallest resistor.
Equation usedResistors in series and parallel
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