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I = 0,2 A
I = U/R -> U = I * R = 20 * 0,2 = 4 V
P = U*I = 4 V * 0,2 A = 0,8 W
Odp. Moc silnika wynosi 0,8 W
I=0,2A
P=?
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P=U*I
prawo Ohma
U=I*R stąd P=I²*R=0,2²*20=0,8W
I=0,2 A
I = U/R -> U = I * R = 20 * 0,2 = 4 V
P = U*I = 4 V * 0,2 A = 0,8 W
Odp.: Moc silnika wynosi 0,8 W