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t= 20 menit= 1.200 sekon
I= 0,5 A
Q=...?
W= I²Rt
W= (0,5)²×100×1.200
W= 0,25× 120.000
W= 30.000 J
1 J→ 0,24 kal
Q= 30.000×0,24
Q= 7.200 kal