1枝36W光管開10小時要用幾多錢電費??

補充 ：pme852
家陣市面上有好多種鎮流器賣有普通 loss = 12W, 10W, 8W 同 6.5W
用電子牛就會更省電, 但係燈管壽命會短啲, 因爲係用高頻率。

By Your Information
E=Pt
=(36W)(10x60x60)
=1296000J
Hence,1kWh = 3600000J
So,1296000J=0.36kWh//
Or
E=Pt
=(36W)(10h)
=360Wh
=0.36kWh//
The Cost Of Electricity = kWh x $0.9
So,0.36kWh x $0.9
= $0.324 for 0.36kWh//

1度電= 1千瓦小時 = 1kWh
1枝36W光管開10小時要用電費是 P x h / 1000 = 36W x 10h / 1000 = 0.36kWh(度電)
兩電力公司收費不同, 中華電力約1度電= 0.9元
所需電費約 = 0.36度電 x 0.9元/度電 = 0.324元
1個月約(用30天計)所需電費約 = 0.36度電 x 0.9元/度電x30天 = HK$9.72