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Domain 2.0 Laptop and Portable Devices

Domain 2.0 Laptop and Portable Devices - A Study Guide...

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A+ Study Guide: Domain 2.0: Laptops and Portable Devices - Laptop Hardware Introduction: This is the first tutorial in our Laptop and Portable devices guide. There are many different terms used for these devices including portable computers, notebooks, and laptops . In this guide, we are going to call them laptops. This particular section of the guide will discuss laptop hardware and accessories. Power: Laptops can run on AC power or on rechargeable batteries. There are 3 types of batteries that are used in laptops as follows: Nickel-Cadmium (Ni-Cd) - This is an older technology that had a few problems. First, the batteries needed to be completely discharged before recharging or they wouldn't hold a very good charge. This was known as battery memory and resulted in comparatively short lifespans. They also had problems when overcharged. These batteries are extremely toxic and MUST be recyled. Nickel-Metal Hydride (Ni-MH) - Still commonly used today, these do not have the charging problems that the Ni-Cd types did. They are much less toxic, but should still be recycled. Lithium-Ion (Li-Ion) - These are the most commonly used batteries used today. They can hold a charge much longer than their predecessors, although cannot be recharged as many times. If a lithium-ion battery is overcharged, it can explode which is why devices that use these batteries have a built-in mechanism to prevent overcharging. Fuel cell batteries are being developed now, but this technology is still very new and probably won't be on the A+ exams. Although power management is used with desktops, it is of much greater concern with laptops. Today, we use specifications known as Advanced Power Management/Advanced Configuration and Power Interface or APM/ ACPI to manage computer power. Devices that work with these specifications are known as Energy Star compliant which means that they use less power and allow APM/ACPI to shut them off when not being used. In addition to compatible devices, modern power management requires a compliant BIOS and operating system . All BIOSes offer APM/ACPI and newer Windows operating systems support APM/ACPI. APM/ACPI is either configured through the BIOS or the operating system, however, the settings in the OS will override the BIOS settings. To access the power management features in Windows, open the Power Options control panel applet. Note that some laptops come with their own proprietary power management applications that may look different and have different features than what you see below.
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This allows you to select from a variety of preconfigured power schemes (such as Portable/Laptop) or you can manually configure the settings for hard drives, monitors, etc. There are a couple of different power states that can configured in the Power Options control panel or they can be activated manually. These states are described below: Stand by - Stand by, also sometimes called is a light sleep mode you can put your computer in. When
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Domain 2.0 Laptop and Portable Devices - A Study Guide...

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