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W = V i t
W = V (V/R) t
W = 12 . 12/2 . 20 . 60 J
W = 12 x 6 x 20 x 60 J = 86.400 J
V = 12 volt
W selama 20 menit
= I² . R . t
= (V/R)² . R . t
= (12/2)² . 2 . 20 . 60
= 6² . 2 . 20 . 60
= 72 . 1200
= 86400 Joule
maka energi yg diperlukan adalah 86400 Joule