сделать два задания The conducting materials give green light to electrons which move from one atom to another when the potential difference is applied across them. This flow of electrons in a closed circuit is called current. On the basis of the direction of movement of electrons in a closed circuit, the electric current is mainly classified into two types, i.e., the alternating current and the direct current.
The current which changes its direction at a regular interval of time such type of current is called alternating current. Direct current is unidirectional or flows only in one direction.
The charges in the alternating current flow either by rotating a coil in the magnetic field or by rotating a magnetic field within a stationary coil. In direct current, the charges flow by keeping the constant magnetism along the wire.
The frequency of the alternating current give or take 50 to 60 hertz depends on the country standard, whereas the frequency of the direct current always remains zero.
The power factor of the alternating current lies between zero to one, whereas the power factor of the direct current always remains one.
The alternating current can be graphically represented through different irregular wave shape such as triangular wave, square wave, periodic wave, the saw-tooth wave, sine wave, etc. The direct current is graphically represented by the straight line.
The alternating current transmits over a long distance with some losses, whereas the direct current transmits over very long distances with negligible losses.
The alternating current is converted into direct current with the help of rectifier whereas the direct current is converted into alternating current with the help of the inverter.
Few substations require for the generation and transmission of the alternating current. Extra substations require for the transmission of direct current.
The alternating current is used in industries, factories, and for the household purposes. The direct current is mainly used in electronic equipment, flash lighting, hybrid vehicles, electroplating, electrolysis, for exciting the field winding of the rotor, etc.

1. Выпишите из текста предложения, содержащие герундий / герундиальный оборот.
2. Найдите в тексте английские идиомы, выпишите и переведите их.

Defects in vision, hearing, speech, or inability to move is limited by many people to communicate, learn, work and influence their environment.Personal computers, supplemented by special devices, and have the appropriate software, can reduce the impact of these defects.For disabled people's computers provide a good replacement for the lost capacity; allow more flexibility for special education; provide access to information not available to them in another way; provide new opportunities for education, work, communicate with people and leisure activities.Blind people can use computers with programs and devices to play it. With the help of computer speech synthesizer pronounces any words appearing on the screen. It provides access to the blind use computers most of the opportunities.In addition, the device and the pattern recognition software in combination with special devices allow computers to display printed text converted into tactile form Braille or speech. Thanks to these systems may blind yourself to read any book, magazine or newspaper without recourse to outside assistance.People with speech disabilities can also benefit from a computer synthesized speech. Keyboard input to the computer the messages you want to say, the dumb man can communicate by phone with a person who can not read.In addition, computerized messaging system is a means of rapid communication over long distances, especially valuable for those with speech or hearing damage, which is not possible using conventional phones.Computers largely also help people with reduced ability to move.Information systems provide people who are unable to go to the library, access to large banks of information.Computer-controlled manipulators (ie, the "hand" of the robot) can be programmed so that they perform the movement for a given program, and feel when in contact with objects. This allows lyudam with impaired motor ability to manipulate objects to perform actions such as eating, flipping pages in books and change a disc into the computer.Many people though do not lose the mobility of the hands or arms can not, operate on a standard computer keyboard. Special keyboard with large touch sensitive keys at the disposal of the people all of your computer.And people who can not work at all; neither coca keyboard voice can control your computer using a speech recognition device. For people with serious violations of voice and motor functions, developed special input device to enable, use a computer for communication and other purposes.Other systems, as has already been created and are in the stage of development and testing, include portable terminals that allow deaf people to send messages from any phone and take them.

1) I dislike it when it is hot and humid and so i stay indoors.

2)There will de a thunderstorm it is so dangerous .

3)There is too much water in the street .The snow is melting very fast.

4)I can't see anything because of the heavy fog.

5)The waether is awful .There is a severe sorm and a heavy rain.

6)There are countries where people haven't experienced freezing temperatures.The temperature is always above zero there .

7)Please open the window .it is stuffy in the romm.

8)Britan is know for its mild temperatues :it's never too hot in summer or too cold in winter.