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P = 300 W
t = 30 menit = 30 x 60 = 1800 s
Ditanya
W = -----?
Jawab
P = 300 W
V = 220 V
t = 30 menit = 1800 sekon
dit: W ?
jb: W = P . t
W = 300 . 1800
W = 540000 J
W = 540 kJ