Предмет: Физика, автор: schymyrkova

Контрольні запитання
1. Яка причина наявності опору струмові у провіднику?
2. Який опір вольтметра, розрахованого на вимірювання напруги до 300 В, якщо
сила струму в ньому не повинна перевищувати 10 мА?
3. Два однакових провідники сплели між собою. Як зміниться опір сплетеного із
двох частин провідника у порівнянні з одним окремим провідником?

Ответы

Автор ответа: fafalk006

1. Причиною наявності опору у провіднику є зіткнення рухомих електронів з іонами кристалічної решітки металового провідника.

2. Опір вольтметра, розрахованого на вимірювання напруги до 300 В, якщо сила струму в ньому не повинна перевищувати 10 мА, дорівнює R=U/I=300/0,01=30000Ом=30кОм.

3. При послідовному з’єднанні повний опір кола дорівнює сумі опорів окремих провідників. При паралельному з’єднанні провідників величина, обернена загальному опору кола, дорівнює сумі величин, обернених опорам паралельно включених провідників.

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