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I = 0,5 A
R= 100 ohm
t = 0,25 menit = 15s
Dit : Energi yg dibebaskan.......?
Jwb :
W = I^2 . R . t
W = 0,5^2 . 100 . 15
W = 0,25 . 100 . 15
W = 375 J
Jadi energi yg dibebaskan setrika tsb sebesar 375 joule