交流電的acacac問題

👨🏻‍🏫 學術台其他 - 科學

家仁

2011-09-20 4:58 am

是咁的...想問下如果呢個圖係代表applied voltage同current既power supply-time圖...咁佢個average power supply 係咪=area A -B /t????咁呢個計法咪同average power dissipation一樣???

更新1:

圖後補thx

更新2:

http://blog.yahoo.com/_OX7SNFS3EZHZG6KRBQT3VE5464/photos/141826#photo-info

更新3:

sor.....wrong... http://blog.yahoo.com/_OX7SNFS3EZHZG6KRBQT3VE5464/photos/141827#carousel

回答 (1)

天同

2011-09-21 9:53 pm

✔ 最佳答案

There is some doublt in your given graph. Power supplied could never be -ve.

Since power is proportional to the square of current, it is thus always +ve irrespective of the current direction.

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