2016汽車駕照的筆試 汽車筆試沒過汽車駕照筆試有效期限汽車筆試時效2015汽車駕照筆試是採用什麼方法考的?2016

"110伏特，60瓦特之燈炮"表示如果該燈炮接的電源是110v，它確實可以表現60w的功率。
(但兩個燈炮串聯後，每個燈泡的電位差僅55v)

先計算一個燈炮電阻R
P=V^2/R =>R=V^2/P=110*110/60 =1210/6(Ω)
電流V=IR
110=I*(1210/6 +1210/6)=(1210/3) I
=> I = 3/11 (A)

一個燈泡損耗之電功率=I^2*R=(3/11)^2*(1210/6)=15 W

----------------------------------------------------

或先計算一個燈炮電阻R
R=V^2/P=110*110/60 =1210/6(Ω)

P=V^2/R =55^2/(1210/6)=15W

This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers. Five Filters recommends: 'You Say What You Like, Because They Like What You Say' - https://www.medialens.org/index.php/alerts/alert-archive/alerts-2013/731-you-say-what-you-like-because-they-like-what-you-say.html