[問題] 國中電學問題
大家好
想請問一個問題
電器插電使用一段時間之後,在插頭處出現生鏽,請問會發生何事?
(a)電器燒壞
(b)保險絲燒斷
(c)插頭過熱而燒斷
答案給(c)
題目我沒有記得很清楚,這是別人問我的
但我沒有頭緒,生鏽電阻似乎不一定上升或下降
這樣不知道該如何由p=v^2 /R來看這個問題
謝謝大家
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 219.70.218.11
※ 編輯: Ertkkpoo 來自: 219.70.218.11 (02/11 20:53)
推
02/11 20:56, , 1F
02/11 20:56, 1F
→
02/11 21:00, , 2F
02/11 21:00, 2F
http://www.phy.ntnu.edu.tw/demolab/phpBB/viewtopic.php?topic=15174
討論區類似問題
※ 編輯: Ertkkpoo 來自: 219.70.218.11 (02/11 21:01)
推
02/11 21:28, , 3F
02/11 21:28, 3F
→
02/11 21:28, , 4F
02/11 21:28, 4F
→
02/11 21:37, , 5F
02/11 21:37, 5F
推
02/11 21:50, , 6F
02/11 21:50, 6F
→
02/11 22:04, , 7F
02/11 22:04, 7F
→
02/11 22:08, , 8F
02/11 22:08, 8F
→
02/11 22:08, , 9F
02/11 22:08, 9F
推
02/11 22:21, , 10F
02/11 22:21, 10F
→ HDT:我記得電阻消耗功率應該是P=I R
02/11 22:21
但是一旦插頭電阻提昇
能夠確保I不變嗎?
如果插頭要燒壞,是要P提昇
因為插頭是交流電,感覺不能用直流那套想法去套v^2/R的公式
這裡的v要變成插頭兩端電位差,但不知道怎麼知道會不會變?
謝謝大家
※ 編輯: Ertkkpoo 來自: 219.70.218.11 (02/11 22:30)
推
02/11 22:32, , 11F
02/11 22:32, 11F
→
02/11 22:32, , 12F
02/11 22:32, 12F
→
02/11 22:33, , 13F
02/11 22:33, 13F
推
02/11 22:35, , 14F
02/11 22:35, 14F
→
02/11 22:37, , 15F
02/11 22:37, 15F
推
02/11 22:40, , 16F
02/11 22:40, 16F
推
02/11 22:44, , 17F
02/11 22:44, 17F
→
02/11 22:44, , 18F
02/11 22:44, 18F
→
02/11 22:45, , 19F
02/11 22:45, 19F
→
02/11 22:45, , 20F
02/11 22:45, 20F
→
02/11 22:46, , 21F
02/11 22:46, 21F
→
02/11 22:47, , 22F
02/11 22:47, 22F
→
02/11 22:48, , 23F
02/11 22:48, 23F
→
02/11 22:50, , 24F
02/11 22:50, 24F
→
02/11 22:51, , 25F
02/11 22:51, 25F
→
02/11 22:52, , 26F
02/11 22:52, 26F
推
02/12 00:44, , 27F
02/12 00:44, 27F
→
02/12 00:45, , 28F
02/12 00:45, 28F
→
02/12 01:55, , 29F
02/12 01:55, 29F
→
02/12 01:58, , 30F
02/12 01:58, 30F
→
02/12 02:00, , 31F
02/12 02:00, 31F
→
02/12 02:01, , 32F
02/12 02:01, 32F
→
02/12 14:24, , 33F
02/12 14:24, 33F
→
08/13 16:03, , 34F
08/13 16:03, 34F
→
09/17 14:03, , 35F
09/17 14:03, 35F
→
01/02 14:41,
5年前
, 36F
01/02 14:41, 36F
→
07/06 22:56,
4年前
, 37F
07/06 22:56, 37F
討論串 (同標題文章)