12 Ω 與 4 Ω 的兩個電阻並聯,等效電阻為何?
Answer and explanation
Correct answer: C. 3 Ω
- Step 1: 並聯:,即 。
- Step 2: Ω。
Answer
3 Ω.
Why not the others: 16 Ω:把並聯當成串聯相加;8 Ω:取兩電阻的平均值;48 Ω:只算了乘積,忘了除以和。
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