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l = 500 m A = 0, 5 A
t = 5 menit = 5 × 60 = 300 s
Q = 2,7 kkal
ditanyakn : R?
tegangan V :
w = v × l × t
11. 296. 8 = v × 0,5 × 300
11.296.8 = v × 150
v = 11.296 . 8 / 150
v. = 75 , 3 12 vlt
jadihambatan
R = v / l
= 75 . 3 12 / 0,5
= 150 , 624 ohm