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I = 12 V/2 ohm
I = 6 A
20 menit = 1200 s
W = V.I.t
= 12 . 6 . 1200
= 86400 J atau 86,4 kj
ket :
V = tegangan (V)
I = arus listrik (A)
R = hambatan (ohm)
W = energi listrik (J)