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P = 12 kW = 12 000 W
W = 30 J
szukane:
t = ?
P = W/t I*t
W = P*t /:P
t = W/P = 30J/12000W
t = 0,0025 s
W=30J
P=W:t
t = W:P
t = 30J : 12000W
t = 0,0025 s