我唔係好識做06 phy mc o既Q21 呀~請大家教我做(要有計算過程)
問題如下:
The figure shows the label of a kilowatt-hour meter connected to a mains supply. When an appliance is switched on for 2 minutes,the circular disc rotates though 24 complete revolutions.What is the electic power consumed by the appliance?
220V 50Hz
600revolutions / kWh <-----個figure有o既資料
希望大家可以幫幫手...教下我e個phy白痴
06 phy ce mc Q21題解
2010-04-16 12:23 am
回答 (2)
2010-04-16 1:37 am
2010-04-16 12:58 am
600revolution 1個kwh
24 revolution = 24/600=0.04kwh
so E=0.04kwh=0.04X3600000=144000J
t=2X60=120s
byp=E/t
p=144000/120=1200W=1.2Kw
2010-04-15 16:59:51 補充：
PS,1KWh=1X1000X3600=3600000J
24 revolution = 24/600=0.04kwh
so E=0.04kwh=0.04X3600000=144000J
t=2X60=120s
byp=E/t
p=144000/120=1200W=1.2Kw
2010-04-15 16:59:51 補充：
PS,1KWh=1X1000X3600=3600000J
參考: me,a f5 student,one of a 2010 HKCEE particpator
收錄日期: 2021-04-23 20:41:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100415000051KK00751