Читайте также:
|
The engineer's public image is somewhat distorted. The layman tends to view the engineer's endeavors as being somewhat mechanical. He imagines that the engineer, given a problem to solve, proceeds to the solution by the application of certain formulae, tables, and graphs; nothing more. The art of engineering is not generally appreciated, yet it is a rare problem indeed that does not give rise to a host of workable solutions. The engineer in fact synthesizes knowledge from many vastly different areas in reaching acceptable solutions.
It is recognized that technology, or its misapplication, is responsible for the various pollution threats and also for devastating weapons of war, and the public assumes that it is the engineers who have brought us to this pass. It should he realized that technology, too operates according to demand, and just as the demand for goods and comfort has led to environmental damage, so technology can also correct this. In one sense engineers with their machines are the tools of society, and it is society that ultimately determines how they are to be used.
Unit 5
Text C Laptops Power Supply
Power Supply like desktops, Laptops can be plugged into the wall to receive AC power from the electric power grid through an AC adapter. But what makes the laptop unique is that it is portable; so, laptops are also powered by batteries. All laptops use some type of rechargeable battery (lithium, nickel-cadmium, nickel-metal hydride).
The battery life varies depending on the type of rechargeable battery (lithium batteries tend to hold their charge longer) and how you use your computer (frequent use of disk drives consumes a lot of battery power). In addition to the main battery, laptops have other batteries to run clocks and backup CMOS RAM.
Unit 6
Text C Laptops Power Supply
Power Supply like desktops, Laptops can be plugged into the wall to receive AC power from the electric power grid through an AC adapter. But what makes the laptop unique is that it is portable; so, laptops are also powered by batteries. All laptops use some type of rechargeable battery (lithium, nickel-cadmium, nickel-metal hydride).
The battery life varies depending on the type of rechargeable battery (lithium batteries tend to hold their charge longer) and how you use your computer (frequent use of disk drives consumes a lot of battery power). In addition to the main battery, laptops have other batteries to run clocks and backup CMOS RAM.
Unit 7
Дата добавления: 2015-01-07; просмотров: 100 | Поможем написать вашу работу | Нарушение авторских прав |