phy electric circuit的問題

如果三個rated'220V 30W'既燈泡connect in series to a 220V main supply會點?三個燈泡都會著定得一個會著?voltage across each light bulbs係幾多?

可唔可以幫我解埋phy 08 ce既paper2 22題?

THX!!

2 Answers

Rating
  • VIc
    Lv 7
    1 decade ago
    Favorite Answer

    每個燈泡的電阻=V2 /P =2202 /30 =1613 ohm

    當三個燈泡串聯連接至220V電源時,

    每個燈泡的電勢差=220 /3 V

    總功率消耗=3 x [(220 / 3)2 /1613]=10W

  • 1 decade ago

    如果三個燈泡都係相同,咁每個燈泡分到73V,有可能會好暗或唔覺得着咗。

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