TestOut LabSim 12.3.2

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Computer Science

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Nov 24, 2024

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4/8/23, 7:39 PM TestOut LabSim https://labsimapp.testout.com/v6_0_544/index.html/productviewer/1193/12.3.2/3b36a3b1-3078-444c-9122-3ab316a269ac 1/3 12.3.2 Laptop Power Facts This lesson covers the following topics: Laptop power management Advanced Con±guration Power Interface (ACPI) Windows Fast Startup USB selective suspend Laptop Power Management Laptop systems are designed to use as little power as possible. To save power, laptops: Turn o² drives that aren't currently being used. Step down the bus speed in the CPU. Turn o² the monitor after a period of inactivity. Put the computer to sleep or turn it o² automatically. A laptop plugged into an outlet receives power through an adapter that converts the AC power from the outlet to DC power usable by the computer. You can use most adapters on both 110 and 220 AC volt power sources. The power from the adapter runs the laptop system and charges the battery. Remember that most adapters are not interchangeable between laptops. Laptops require varying amounts of voltage and amperage. They also use di²erent plugs. Before connecting a laptop to an adapter, make sure the power adapter is the correct adapter for the laptop. Also, make sure the plug is the correct size and ±ts easily into the laptop. Failing to use the correct adapter can cause a laptop to: Receive insu³cient power to turn on. Receive insu³cient power to charge the battery. Receive an excess of power that may cause damage to the system. ACPI Many portable devices use ACPI to save power and manage its use within the device. ACPI is designed to prolong and optimize battery life. The host operating system often implements and controls ACPI management. In Windows, for example, you change ACPI settings using Control Panel. ACPI controls the distribution of power as follows:

4/8/23, 7:39 PM TestOut LabSim https://labsimapp.testout.com/v6_0_544/index.html/productviewer/1193/12.3.2/3b36a3b1-3078-444c-9122-3ab316a269ac 2/3 Alters amount of power sent to the CPU to control processing. Dims or turns o² display. Powers down internal storage devices. The ACPI power states are described in the following table. Power State Characteristic Working System is fully powered and operational. Standby System is in a low power state and can change quickly to the working state. RAM is fully powered; screen and storage devices are power down. Sleep Sleep is similar to standby. In many systems, sleep and standby are the same. On a Mac, the system goes into hibernate mode if the power level gets below a given threshold. Hibernate During hibernation, the contents of RAM are stored on internal storage to preserve system state; then, the system is completely powered down. When the system restarts, the contents of hibernation ±le are copied to RAM. O² System is shutdown and power to all devices including RAM are powered down. Windows Fast Startup Windows Fast Startup changes how a machine shuts down. Typically, when a machine shuts down, all programs are closed and the machine is powered down. Key points of Windows Fast Startup are: When a user logs o², all open programs are hibernated. When the system is powered on, all open programs are restored to the system's state where the user left o². This is often called an hybrid shutdown. Windows Fast Startup is enabled by default. USB Selective Suspend When a device is connected to a USB port, it is not always in use. The USB selective suspend feature helps to conserve power when USB ports are not in use. Key points of USB selective suspend are: If the system detects the USB device is not in use, it will stop providing power to the port.

4/8/23, 7:39 PM TestOut LabSim https://labsimapp.testout.com/v6_0_544/index.html/productviewer/1193/12.3.2/3b36a3b1-3078-444c-9122-3ab316a269ac 3/3 When that device become active again, the system provides power to the port enabling the device. There may be a short delay accessing the USB device; however, the delay is hardly noticeable. Copyright © 2023 TestOut Corporation All rights reserved.

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