phy mc (equivalent resistance)

👨🏻‍🏫 學術台其他 - 科學

用戶250240

2009-11-28 9:18 pm

the question is on this website (it's safe) :
http://i748.photobucket.com/albums/xx125/zxc123_06/phymc.jpg

the ans is C

Please explain it to me.

更新1:

Why the two resistors on the left are short-circuited?

更新2:

Why the two resistors on the left are short-circuited?

回答 (1)

Prof. Physics

2009-11-28 11:06 pm

✔ 最佳答案

We see that from the left square.

The two resistors are short-circuited.

So, actually, we don't need to calculate those two resistors.

And so, we just need to consider the right two resistors, they are connected in parallel.

So, the equivalent resistance

= (1/8 + 1/8)^-1

= 4 ohms

Answer: C

參考: Physics king

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