Question

Страница 14 (Text A) Упражнение 10 (Прочитайте текст) Страница 15, упражнение 11 (ответьте на вопросы по тексту ПОЛНЫМИ английскими предложениями) Voltage and Current Characteristics of Resistors The resistor is an electrical device whose primary function is to introduce resistance to the flow of electric current. The magnitude of opposition to the flow of current is called the resistance of the resistor. A larger resistance value indicates a greater opposition to current flow. The resistance is measured in ohms. An ohm is the resistance that arises when a current of one ampere is passed through a resistor subjected to one volt across its terminals. The vari- ous uses of resistors include setting biases in p-n junction, controlling gain, fixing time con- stants, matching and loading circuits, voltage division, and heat generation. The resistance of a resistor is directly proportional to the resistivity of the material and the length of the resistor and inversely proportional to the cross-sectional area perpendicular to the direction of current flow. Resistivity is an inherent property of materials. Good resistor materials typically have resistivities between 2  10-6 and 200  10-6 ·cm. The resistance can also be defined in terms of sheet resistivity. If the sheet resistivity is used, a standard sheet thickness is assumed and factored into resistivity. Typically, resistors are rectangular in shape; therefore the length l divided by the width w gives the number of squares within the resistor. The number of squares multiplied by the resistivity is the resistance. The resistance of a resistor can be defined in terms of the voltage drop across the resistor and current through the resistor related by Ohm’s law. Whenever current is passed through a resistor, a voltage is dropped across the ends of the resistor. Ex. 11 Answer the questions to the text A: 1) What’s the primary function of a resistor? 2) How is the magnitude of opposition to the flow of current called? 3) What is an Ohm? 4) What are the characteristics of resistors? 5) What is shown in the scheme below?

Answer 1

Ответ:1. The resistor is an electrical device whose primary function is to introduce resistance to

the flow of electric current.

2.The magnitude of opposition to the flow of current is called the

resistance of the resistor.

3.The resistance is measured in ohms. An ohm is the resistance that arises when a current

of one ampere is passed through a resistor subjected to one volt across its terminals.

Объяснение:

Answer 2

To answer the questions based on Text A:

1. What’s the primary function of a resistor? The primary function of a resistor is to introduce resistance to the flow of electric current.

2. How is the magnitude of opposition to the flow of current called? The magnitude of opposition to the flow of current is called the resistance of the resistor.

3. What is an Ohm? An Ohm is the unit of measurement for resistance. It is the resistance that arises when a current of one ampere is passed through a resistor subjected to one volt across its terminals.

4. What are the characteristics of resistors? The characteristics of resistors include:

• Resistance is measured in ohms.
• The resistance of a resistor is directly proportional to the resistivity of the material and the length of the resistor and inversely proportional to the cross-sectional area perpendicular to the direction of current flow.
• Good resistor materials typically have resistivities between 2 x 10^-6 and 200 x 10^-6 Ω·cm.
• Resistors are used for various purposes such as setting biases in p-n junctions, controlling gain, fixing time constants, matching and loading circuits, voltage division, and heat generation.

5. What is shown in the scheme below? Unfortunately, the text does not include any information about a scheme or diagram, so we cannot answer this question based on the given text.