7) Complete the sentences using the correct variant. 1. A resistor is used: a) to measure the resistance; b) to reduce the current; c) to change the resistance; d) to produce IR voltage drop. 2. When current passes through a resistor: a) its temperature drops; b) its temperature rises. 3. Resistors are rated: a) in ohms; b) in volts; c) in watts. 4. Power is given: a) in amperes; b) in watts; c) in volts. 5. Fixed resistors have: a) a constant value; b) a variable value. 5. The value of a variable resistor: a) is fixed; b) is varied. 7. A two-ohm resistor 8,000,000 W resistor: a) has a current-carrying capacity equal to 2000 A; b) has a current-carrying capacity equal to 200 A. 8. The higher the value of current a) the lower is the temperature of a resistor; b) the higher is the temperature of a resistor.

Question

Вопрос:

Фото задания: 7) Complete the sentences using the correct variant. 1. A resistor is used: a) to measure the resistance; b) to reduce the…

7) Complete the sentences using the correct variant. 1. A resistor is used: a) to measure the resistance; b) to reduce the current; c) to change the resistance; d) to produce IR voltage drop. 2. When current passes through a resistor: a) its temperature drops; b) its temperature rises. 3. Resistors are rated: a) in ohms; b) in volts; c) in watts. 4. Power is given: a) in amperes; b) in watts; c) in volts. 5. Fixed resistors have: a) a constant value; b) a variable value. 5. The value of a variable resistor: a) is fixed; b) is varied. 7. A two-ohm resistor 8,000,000 W resistor: a) has a current-carrying capacity equal to 2000 A; b) has a current-carrying capacity equal to 200 A. 8. The higher the value of current a) the lower is the temperature of a resistor; b) the higher is the temperature of a resistor.

Accepted Answer

Перевод задания: Дополните предложения, выбрав правильный вариант.

1. A resistor is used to reduce the current and to produce an IR voltage drop (b, d). Оба утверждения верны: резистор может ограничивать ток и создавать падение напряжения. Если требуется только один ответ, наиболее общий вариант — b.

2. When current passes through a resistor, its temperature rises (b), поскольку электрическая энергия рассеивается в виде тепла.

3. Resistors are rated in ohms (a) — это единица сопротивления.

4. Power is given in watts (b).

5. Fixed resistors have a constant value (a).

5. The value of a variable resistor is varied (b).

7. A two-ohm resistor rated at 8,000,000 W has a current-carrying capacity of 2000 A (a): из \(P=I^2R\), \(I=\sqrt{P/R}=\sqrt{8000000/2}=2000\) А.

8. The higher the value of current, the higher is the temperature of a resistor (b), при прочих равных условиях.

Перевод ответов: 1. Резистор используют для уменьшения тока и создания падения напряжения IR. 2. При прохождении тока температура резистора повышается. 3. Сопротивление измеряют в омах. 4. Мощность измеряют в ваттах. 5. Постоянный резистор имеет постоянное значение. Переменный резистор имеет изменяемое значение. 7. Токовая нагрузочная способность составляет 2000 А. 8. Чем больше ток, тем выше температура резистора при прочих равных условиях.

Ответ: