the knife switch - рубильник
to make and break the circuit - замикати або размикати ланцюг
to keep the current from being excessive - предохранять вiд перевантаження
in series - послiдовно
gradually removes - поступово виводиться
2. Read and translate the text.
In electrical systems for the generation, distribution and use of electrical energy, considerable control equipment is necessary. It can be divided into two classes: a) equipment used at the generating and distributing end; d) equipment used at the receiving end of the system.
Safety switches are used at the point where the power enters a building . They are of the knife type and are usually enclosed in metallic boxes.
A magnetic contactor is used to make and break the circuit at the points where considerable power is used.
An automatic starter is a device which is used to keep the current from being excessive while the motor is obtaining full speed. It is a kind of a resistance inserted in series with the direct current armature. As the motor obtains speed it gradually removes.
3. Answer the following questions.
1. Is control equipment necessary in electrical systems?2. Can it be divided into two or four classes?
3. Where safety switches are used?
4. Is a magnetic contactor used to make and break the circuit at the points where considerable power is used?
5. Where is the knife type enclosed?
6. Where is a magnetic contactor used?
7. Where is an automatic starter used?
4. Translate from Ukrainian into English.
Electrical systems, electrical energy, control equipment, safety switches, the knife type, metallic boxes, a magnetic contactor, an automatic starter, a resistance.5. Complete the sentences.
1. In electrical systems for the generation, distribution and ___________________________ .2. It can be divided into two ___________________________________________________ .
3. Safety switches are used at the point___________________________________________.
4. They are of the knife type and ________________________________________________ .
5. A magnetic contactor is used to _______________________________________________ .
6. An automatic starter is a device which is used to _________________________________ .
7. As the motor obtains _______________________________________________________ .