Определите силу тока I, проходящего через реостат, изготовленный из никелиновой проволоки (ρ= 0.4 Ом*мм2/м), длиной l = 50 м и площадью поперечного сечения S= 2 мм2, если напряжение на зажимах реостата равно U = 45 В.

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лолл18

Физика

4,7(44 оценок)

Найдём сопротивл. проволоки: R=p*L/s=0.4*50/1=20ом

Найдём ток I=U/R=45в/20=2.25а

ответ:ток черезреостат =2.25а

Объяснение:

ответ моет быть не верным!

ildarka34

Физика

4,6(33 оценок)

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