Odpowiedź:
1.
U = 230 V
P = 80 W
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I = ?
P = U*I
I = P/U = 80W/230V = 8/23 A ≈ 0,348 A
I = 0,348 A
2.
U = 4,5 V
t = 10 s
W = 200 J
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I = ?
W = P*t
P = W/t = 200J/10s = 20 W
P = U*I
I = P/U = 20W/4,5V = 40/9 A ≈ 4,44 A
I = 4,44 A