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dane: R=8om, Um=24V, t=60s
szukane: Q
W = Q = Usk^2*t/R ale Usk = Um/2^1/2 czyli Usk^2= 0,5 *Um^2
Q = 0,5*Um^2*t/R = 0,5*[24V]^2*60s/8om = 2160J =2,16kJ
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