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1. Read and translate the text

Electrical energy

Almost any form of energy can be converted into electricity. The most common methods of producing electricity are those used in batteries or generators. Power from batteries is generated by converting chemical energy into electrical energy. Most generators convert heat energy (from burning fuel) into electrical energy. Some generators use such natural resources as sunlight or wind to obtain electrical energy.

Static electricity

Unlike current electricity, static electricity doesn't flow. It is created when an electrically neutral substance loses or gains electrons (negatively charged particles ), making it respectively , positively or negatively charged. You can create static electricity by rubbing a balloon on your clothing . Electrons will move from the clothing to the balloon, making the balloon negatively charged and the clothing positively charged. The resulting static electricity on each will attract small, light objects such as piece of paper.

Give Ukrainian equivalents to the following word combinations:

Be converted

be generated

heat

burning

fuel

exploit

to obtain

Answer the following questions:

1. Can every form be converted into electricity?

2. What are the most common methods of producing electricity?

3. How is power from batteries generated?

4. Do some generators exploit any natural resources?

5. When does a static electricity create?

6. How can one create static electricity?

7. What makes the electrons move?

8. What is the result static electricity?

Lesson 10

Operating systems

An operating system provides the basic instructions that tell the computer how to handle certain tasks necessary for it to work. The operating system of a large computer can be very complicated, because it has to control so many functions. A microcomputer's operating system is simple by comparison.

Suppose you had a computer with no operating system. (Yes, there are such machines.) You would have to write a program—a very complex program—in order to get the computer to do anything. Among other things, you would have to explain in your program how the computer should interpret the pressing of each key. Such a computer provides good training for a computer scientist, but it is of little value to most ordinary users.

An operating system gets you over that hurdle. It consists of a set of prewritten instructions. The operating system is the program that makes it possible for you to run all other programs that are available or can be written for your computer. The operating-system program may exist just in ROM.

DISK OPERATING SYSTEMS

A disk operating system, or DOS (pronounced dahs) is a program that controls the storage of information on disks. DOS also makes it possible for the computer to use various programs that are already stored on disks. Most packaged programs for computers are available on disks, and the DOS is what gets these programs started. Obviously, the system requires a disk drive.