85
REVISION
Insert the words into sentences
phenomena
society
heating
electricity
charge
lighting
scientific
electrons
equipment
atoms
current
essential
1.
What is …?
2.
From the … point of view, the electricity is a particular set of physical
… which is characterized by the presence and the distinctive flow of electric ….
3.
It is created when the small particles - … move between the … .
4.
This process creates an electric … .
5.
And this current is used to energize different kinds of … .
6.
We use electricity for … , cooling and … our houses, for cooking
food, for numerous devices and gadgets.
7.
Electric power has become the … necessity for the modern … .
Look through the text attentively. Grammatical phenomena found in
the text include participles, word formation and passive voice. Choose
some words and explain the formation and usage of these phenomena
A fuse is a protective device containing a short length of special wire that
melts when the current through it exceeds the rated value for a definite period
of time. A fuse is inserted in series with the circuit being protected, so it opens
the circuit automatically during a serious overload
The typical fuse consists of an element which is surrounded by a filler and
enclosed by the fuse body. The element is welded or soldered to the fuse
contacts (blades or ferrules).
The element is a calibrated conductor. Its configuration, mass and the
materials employed are selected to achieve the desired electrical and thermal
characteristics. The element provides the current path through the fuse. It
generates heat at a rate dependent on its resistance and the load current.
The heat generated by the element is absorbed by the filler and passed
through the fuse body to the surrounding air. The filler material, such as quartz
sand, provides effective heat transfer and allows for the small element cross-
section typical in modern fuses. The effective heat transfer allows the fuse to
carry harmless overloads. The small element cross section melts quickly under
