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diketahui :
V = 20 V
R = 4 Ohm
t = 10 menit = 10 x 60 = 600s
ditanyakn : W ?
dijawab :
W = V²/R x t
= 20²/4 x 600
= 400/4 x 600
= 100 x 600
= 60.000 J (A)
nomor 15 :
Diketahui :
V = 6 Volt
I = 2 A
W = 216 KJ = 216.000 J
ditanyakn : t ?
dijawab :
W = V x I x t
216.000 = 6 x 2 x t
216.000 = 12 x t
t = 216.000/12
t = 18.000 s
t = 18.000/3.600
t = 5 jam (D)