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P = I.V
V = I.R
V= 3 .5
V = 15 volt
P= 15.3
P = 45 watt
W = 45.15
= 675 joule
R= 5 Ω
t= 15 s
I= 3 A
Dit:
W=..?
Penye:
W= I².R.t
W= 3²×5×15
W= 9×5×15
W= 675 J