想問一問
initial reading 同final reading 分別代表咩意思???
例:initial reading =1.4kw final reading =1.5kw 測水shc
姐係本身個power supply 係放1.4 ,,之後變左放1.5 ?????
定係水的能量由1.4變1.5.....so 計佢放energy就係1.5 -1.4???
定係點??
phy heat power supply
2008-07-19 4:34 am
回答 (1)
2008-07-19 12:05 pm
✔ 最佳答案
initial reading =1.4kw <--單位唔係kw 你呢個係千瓦時計定係焦耳計??千瓦時計既單位係kWh
焦耳計既單位係J
initial reading 係o係未開加熱器個陣~已經去到既度數
final reading 係o係做完實驗個陣既度數
所以我地計既時候就會用final reading - initial reading
姐係1.5kWh - 1.4kWh = 0.1kWh
咁佢用左既能量就係 0.1 x 1000 x 3600 = 360000J
k = 1000
h = 1小時 = 3600s
E=Pt (P單位係W)
參考: 自已
收錄日期: 2021-04-25 23:21:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080718000051KK02605