DEMOCRATIC AND POPULAR ALGERIAN REPUBLIC

MINISTRY OF THE SUPERIOR TEACHING AND THE SCIENTIFIC RESEARCH

SUPERIOR NORMAL SCHOOL OF TECHNICAL TEACHING OF ORAN

TECHNICAL ENGLISH FOR GRADUATE STUDENTS

COMPOSITION AND SUMMARISINGLESSON 1

First name: AbdelkaderFamily name: Mechernene 

Option of the magister:

Analysis and command of electrics machines

university year: 2005 / 2006

TECHNICAL ENGLISH FOR GRADUATE STUDENTS_________________________________________________________________________________________5.1 Revision exercise

1. I will meet you at the office tomorrow.

2. Mohamed and I sit beside each other at the same desk

3. Please put your homework on the table.

4. He lives at N° 15, Revolution Street. I have lived in that street ten years ago.

5. The distance of Oran to Algiers is 450 Km.

6 The pendulum of a clock goes up and down all the time.

7 Put a hyphen between this two words.

8 The courant through this resistor is well at the maximum value.

9 Cross to the other side of the road, walk along the road, turn towards your left along the

junction and go to the first shop

10. The operational amplifier acts on a voltage controlled current sink.

11. When the bridge is balanced, the inductance or the transformer drops rapidly.

12. A power source such as a solar cell is used in calculators.

13. A MOSFET is used in an R F preamplifier.

14. He works at an accountant and spends money as a king.

15. If only you could type like my last secretary !

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TECHNICAL ENGLISH FOR GRADUATE STUDENTS_________________________________________________________________________________________16. The frequency was changing when we adjusted the speed.

17. Don't dash on the road like that.

18 My son goes to school.

19. This morning I have coffee though I usually take tea.

20. The firm has been making good profits this year.

21. He is learning to use Internet at last.

22. I’m trying to write a book for years.

23. Please wake him up! He has been sleeping for ten hours.

24. The solution to this problem is published in microelectronics Journal.

25. The aim of this book is to teach English.

26. The effect of high-injection is neglected, isn’t it? Yes it is.

27. You must take it into account, mustn’t you ? I must.

28. You can find an expression for this phenomena, can’t you? Yes I’ can.

29. I need help, needn’t I? Yes you need.

30. She hasn't done her homework, has she? No she hasn’t.

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TECHNICAL ENGLISH FOR GRADUATE STUDENTS_________________________________________________________________________________________ 5.2 Composition

What is the Ohm‘s law? Ohm discovered that it exists a relation between the voltage to extremities of a resistor and the current that crosses it. I must verify this law by a small experience.I need a generator of direct current, a voltmeter, an amperemeter and three resistors (100, 1000, 10000). I make the electric installation represented on the diagram of the diagram .1. After verification, I close the switch K and I apply voltage to the circuit. For the resistance of 100, I make vary this voltage of the generator since 0 and until 30 Volts (of 3Volts in 3 Volts). I raise indications of measure devices. I restart the same work for the two other resistors (1000, 10000).Then I draw the curves I = f(U) for the three resistors on a same sheet of paper millimetre (diagram .2.).I notice that:

- for the three resistors, the curves are lines and mathematically written as:

where U and I are the appropriate values of voltage and the intensity, b being a constant.- for a same voltage, more the value of the resistance is small more the current is big.

This constant b is important and Newton named it the resistor of the element and noted it R. Inserting this constant in the previous relation it follows that:

The conclusion is that the voltage to extremities of a resistor is proportional to the product of the value of this resistor and the intensity of the current that crosses it.

This law is one of the most important laws for the physics and the general electricity.

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0

I

U10

30

20

100

1000

10000 I2

I3

Diagram .2.Diagram .1.

A

V

R

I

I1

U

K