Exam-style question
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In a parallel circuit with two resistors of 6 Ω and 3 Ω, what is the total resistance?.
- A.2 Ω
- B.4 Ω
- C.1.5 Ω
- D.9 Ω
Model answer
What a good answer should say
- 2 Ω
Explanation
Why this works
The total resistance (R_total) in a parallel circuit is given by the formula 1/R_total = 1/R1 + 1/R2. For R1 = 6 Ω and R2 = 3 Ω, substituting gives: 1/R_total = 1/6 + 1/3 = 1/6 + 2/6 = 3/6.
Therefore, R_total = 6/3 = 2 Ω. The total resistance is 2 Ω.
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