Jawabanmu

2014-08-24T09:17:43+07:00
Diket :
 V = 200 V
t= 30 menit = 30.60 s = 1800 s
R= 400 ohm
d tanya enrgi (W)= .....?

jawab:
W = V ^{2} / R . t
   = 200.200 / 400 . 1800 = 180.000 Joule = 180 kJ