電路學一題 - 考試

By Gilbert
at 2020-06-11T20:26
at 2020-06-11T20:26
Table of Contents
想請問一題電路學
https://i.redd.it/6c20bw3bx9451.jpg

想請問為什麼在0<t<3的時候 等效R是那樣算
而在t>3的時候 等效R又變成是10歐姆跟10歐姆並聯,而不用考慮5歐姆了呢?
感謝
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