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I = 0,25 A
t = 20 menit = 20×60 = 1200 sekon
W = I R I t
= 0,25×16×0,25×1200
=1200 J
R =16 ohm
t = 20 menit =1200 s
ditanya = W?
jwb = I² x R x t
=0,25²x16x1200
=1200 W
=1,2kW