Предмет: Физика, автор: Doksnejxiclcmdn

1. Визначити максимальну силу струму на електричній лампі опором 100 Ом, яка

ввімкнена у мережу 220 В.
2. Визначити площу алюміневого дроту довжиною 100м і опором 0,7 Ом.
Будь ласка допоможіть срочно

Ответы

Автор ответа: zinovicgrigorij
0

Ответ: 2,2А; 4мм²

Объяснение:

Дано:

R=100 Ом

U=220В

---------------

I-?

Согласно закона Ома:

I=U/R=220/100=2,2А

Дано:

l=100м

R=0,7 Ом

ρ=0,028 Ом*мм²/м

---------------------

S-?

R=ρl/S, где:

ρ-удельное сопротивление проводника;

l-длина проводника;

S-площадь поперечного сечения проводника.

Отсюда:

S=ρl/R=0,028*100/0,7=4мм²

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