Lesson 1 power engineering

1. Answer the questions.

1. 
   What does modern power engineering consist of?
   
2. 
   How do all three components function?
   
3. 
   What is the generation of electrical power?
   
4. 
   What are the forms of transformation process?
   
5. 
   How does the AC synchronous machine work?
   

USE OF ENGLISH

2. Match the words to their definitions.

1	generation	A	change or be able to change from one form to another
2	deal with	B	an electromotive force or potential difference expressed in volts
3	resistance	C	a device that converts mechanical energy to electrical energy for use in an external circuit.
4	subsequent	D	the production of something
5	convert	E	coming after something in time
6	voltage	F	capacity or performance of an engine or other device
7	transmission	G	be concerned with
8	power	H	the action of sharing something out among a number of recipi- ents
9	distribution	I	ability of a substance or an electrical circuit to stop the flow of an electrical current through it
10	electric generator	J	the mechanism by which power is transmitted from an engine to the wheels of a motor vehicle

2. Fill in the blanks with the words from the table.

electric current	neutral wire	alternating currents
transfer	three-phase system	single-phase appliances

In a 1 three circuit conductors carry three 2 (of the same frequency) which reach their instantaneous peak values at different times. Taking one conductor as the reference, the other two currents are de- layed in time by one-third and two-thirds of one cycle of the 3. This delay between phases has the effect of giving constant power 4 over each cycle of the current and also makes it possible to produce a rotating magnetic field in an electric motor.
Three-phase systems may have a 5. A neutral wire allows the three-phase system to use a higher voltage while still supporting lower- voltage 6. In high-voltage distribution situations, it is common not to have a neutral wire as the loads can simply be connected between phases (phase-phase connection).

2.