水草情迷

我的火牛上寫

5 把 0.3A 風扇加埋要用 1.5A 即係 1500mA, 你隻牛唔夠力推喎.
300mA 只夠推一把.

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Recall 中學的物理:
若果你的風扇是12V的,而你的火牛是12V,風扇就全速轉動.若你的火牛是9v,風扇就約七成半速度轉動.
至於A數,代表電流流量,你5把風扇各0.3A,若果以所有黑線縛黑線,紅線縛紅線 (即parallel connection),共要1.5A.
我也不知道可否用serial connection方法,即第一把風扇的黑線縛第二把的紅線.如此類推,最後第一把風扇的紅線與最後一把風扇的黑線縛到火牛.那只要0.3A

有冇人知多D?

thx, superctw & kelvin.
kelvin, have u bought your filter?

Yes, bought. PM you later

如果串聯計 , 理論上就要 12V X 5 = 60V , 0.3A
不過都係唔好咁做拿 !!

I've a 6x DIY cooling fan before and I hope my experiience would be useful to U

Voltage
All fans must be connected in parallel so as to provide a constant voltage - 12V to all of them

若果你的風扇是12V的,而你的火牛是12V,風扇就全速轉動.若你的火牛是9v,風扇就約七成半速度轉動.
Yes, I turn down the voltage of transformer from 12V to 9V, they still work but in lower rate.

Current
至於A數,代表電流流量,你5把風扇各0.3A,若果以所有黑線縛黑線,紅線縛紅線
1A=1000ma, and hence total current required: 0.3A x 5 = 1.5A

Serial connection方法 may not be work in this case as the voltage would continue to drop from the 1st fan to the 5th fan, that mean the 1st one is faster and the 5th one is slower.

At Ap Lui St., U can find there's an "electronic transformer" 12V, 1.5A. It cost around $80.

如果全部 內阻 一樣 , 絕對係唔會發生咁既事

如果用串聯其中有一個Fan壞左就會影响其他Fans運作. 用並聯會適合得多
如果火牛用12V 1.5A. 個火牛會好鬼熱!!! 買大D火數, 即12V, 2A or more

thx, every big brother!

去深水步買只notebook火牛la，12V 3A至5A都完全冇問題．我都係噤用．

一個電腦用的火牛那就解決了嗎??
都係$50o者~