- •И.Н. Федотова
- •Старый Оскол 2011
- •Содержание
- •Введение
- •Содержание учебной дисциплины Аудирование
- •Говорение
- •1. Ответьте письменно на следующие вопросы:
- •Text 2. Ohm's Law
- •Solve the following problems using the formulas of Ohm’s Law:
- •Pair work. Make up similar problems of your own. Ask your groupmate to solve them.
- •Complete these sentences using the correct variant:
- •2. Answer the following questions:
- •Text 4. Conductors and Insulators
- •1. Find answers to these questions in the text above:
- •2. Complete the sentences using the correct variant:
- •Text 5. Electric generators and motors
- •Text 6. D.C. Electric motors
- •Text 7. A.C. Electric motors
- •Put English equivalents to the following:
- •1. Complete these sentences using the correct variant.
- •2. Put down the Russian for:
- •3. Answer these questions:
- •Text 9. Substations
- •1. Complete the sentences using the correct variant:
- •2. Pair work. Put these questions to your groupmate, and ask him/her to answer them.
- •3. Put down the Russian equivalents of these word combinations. Translate them back into English.
- •1. Complete the sentences using the correct variant:
- •2. Pair work. Put these questions to your groupmate and ask him/her to answer them:
- •3. Put down the Russian equivalents of these word combinations. Then translate them back into English.
- •Text 11. Atomic Power Plant
- •1. Complete the sentences using the correct variant:
- •2. Pair work. Put these questions to your groupmate and ask him/her to answer them:
- •Unit 2. Material science and technology. Metallurgy Text 1. Metals
- •1. General understanding:
- •2. Find the following words and word combinations in the text:
- •3. Complete the following sentences:
- •4. Translate into English:
- •Text 2. On metals
- •Text 3. Steel
- •1. General understanding:
- •2. Find the following words and word combinations in the text:
- •Text 4. Methods of steel heat treatment
- •1. General understanding:
- •2. Translate into English the following words and word combinations:
- •Text 5. Ferrous metals
- •Translate into English the following words and word combinations:
- •Text 6. Non-ferrous metals and non-metallic materials
- •Text 7. Copper
- •Translate into English the following words and word combinations:
- •Text 8. Aluminium
- •Translate into English the following words and word combinations:
- •Unit 3. Metalworking Text 1. Mechanical properties of materials
- •1. General understanding:
- •2. Find the following in the text:
- •3. Translate into English the following sentences:
- •Text 2. Mechanical Properties of Materials
- •1. General understanding:
- •2. Find the following words and word combinations in the text:
- •3. Translate into English the following:
- •Text 3. Metalworking and metal properties
- •1. General understanding:
- •2. Find the following in the text:
- •3. Translate into English:
- •Text 4. Welding
- •1. General understanding:
- •2. Find the following words and word combinations in the text:
- •Text 5. Other types of welding
- •Resistance Welding
- •1. General understanding:
- •3. Translate into Russian:
- •Unit 4. Engineering Text 1. Machine-tools
- •Text 2. Lathe
- •1. General understanding:
- •2. Find English equivalents in the text:
- •3. Translate into English:
- •Text 2. Milling machine
- •Drilling and Boring Machines
- •Shapers and Planers
- •Grinders
- •1. General understanding:
- •2. Translate into English:
- •Text 4. Dies
- •Wiredrawing Dies
- •Thread-Cutting Dies
- •1. Find English equivalents in the text:
- •2. Translate the following sentences into Russian:
- •Text 6. Cranes
- •Vocabulary unit 1
1. Ответьте письменно на следующие вопросы:
1. What is electricity? 2. What is a magnetic field? 3. What connection is there between electricity and magnetism?
2. Переведите на русский язык следующие словосочетания:
electrification by friction, quantitative measurements, inversely proportional, units of charge, electric field, charged body, magnetic lines of force, static electricity, flow of electrons, chemical energy, electrical resistance, cross-section, difference of potential, in series, in parallel, reciprocal of resistance, free electrons, modern household.
Text 2. Ohm's Law
R= V/I Resistance equals voltage divided by current
I= V/R Current equals voltage divided by resistance
V= IR Voltage equals current times resistance
Problem
V= 1V
I= 1 amp
R=?
Suppose that resistance equals one volt and current equals one ampere. How much is resistance?
Solution
R=V/I, 1V/1 amp = 1 ohm
Solve the following problems using the formulas of Ohm’s Law:
Model: - Current equals 5 amp; resistance equals 10 ohms. How much is the voltage? - Voltage equals current times resistance. 5 x 10 = 50 V
1) R = 80 ohms 2) R=10.25 ohms 3) V=50.05V
V=55V I=35 amp I=120 amp
I=? V=? R=?
4) I=10500 amp 5) V=20.05 V 6) I=0.24 amp
V=2000 V R=0.015 ohm R= 1.36 ohms
R=? I=? V=?
Pair work. Make up similar problems of your own. Ask your groupmate to solve them.
Text 3. Series Circuit and Parallel Circuit
Compare circuits a and b. Circuit a consists of a voltage source and two resistors. The resistors are connected in series. Circuit a is a series circuit.
Circuit b consists of a voltage source and two resistors. The resistors are connected in parallel. Circuit b is a parallel circuit.
A parallel circuit has the mam line and parallel branches.
In circuit b the value of voltage in R1 equals the value of voltage in R2. The value of voltage is the same in all the elements of a parallel circuit while the value of current is different. A parallel circuit is used in order to have the same value of voltage.
In circuit a the value of current in R1 equals the value of current in R2. The value of current is the same in all the elements of a series circuit while the value of voltage is different. A series circuit is used in order to have the same value of current. In R1 V1=IR1 is the voltage drop in R1. In R2 the voltage equals IxR2; IR2 is the voltage drop in R2. In circuit с a trouble in one element results in no current in the whole circuit. In circuit d a trouble in one branch results in no current in that branch only, a trouble in the main line results in no current in the whole circuit.