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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The Clown Doctor

When a child is in hospital, away from his parents and his home, he usually feels sad, lonely and in pain. This is where clown doctors can help. They treat children in hospitals with medicines of a different kind… fun and laughter! Children can forget about their illnesses for a moment and return to a world of happiness and play. It is hard to keep a sad face when clown doctors come in!

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