[閒聊] 電阻
最近看到一張梗圖
https://i.imge.tw/VwV.png

好奇算了一下等效電阻
三個10K並聯 = 1 / (1/10 + 1/10 + 1/10) = 1 / (3 / 10) = 10 / 3
再跟兩個10K串聯 = 10 / 3 + 10 + 10 = 70 / 3
最後跟一個10K並聯 = 1 / ( 1 / 70 / 3 + 1/ 10 )
= 1 / (3 / 70 + 1 / 10) = 1 / ( 3 / 70 + 7 / 70 )
= 1 / (10 / 70) = 70 / 10 = 7
幹真的是7K!
好神奇啊啊啊!!
那其它1~9K電阻
各自最少需要用幾個10K電阻並聯串聯而成
鄉民們知道嗎?
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