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storage for data and instructions as they are being processed by the CPU.A computer power supply, also known as a power supply unit (PSU), is a box installed in a corner of the computer case (see Figure 1-18) that receives and converts the house current so that components inside the case can use it. Most power supplies have a dual-voltage selector switch on the back of the computer case where you can switch the input voltage to the power supply if necessary--115 V is used in the United States and 220 V is used in other countries.One installed DIMM Three empty DIMM slots Figure 1-16 A DIMM holds RAM and is mounted directly on a motherboard Hard drives and other drives.Each drive has two connections for cables: The power cable connects to the power supply, and another cable, used for data and instructions, connects to the motherboard.These three drives are also shown in Figure 1-17.

storage for data and instructions as they are being processed by the CPU. The memory module shown in Figure 1-16 contains several RAM chips. Video cards also contain some embedded RAM chips for video memory.
One installed DIMM
Three empty DIMM slots
Figure 1-16 A DIMM holds RAM and is mounted directly on a motherboard
Hard drives and other drives. A system might have one or more hard drives and an optical drive. A hard drive, also called a hard disk drive (HDD), is permanent storage used to hold data and programs. For example, the Windows 10 operating system and applications are installed on the hard drive. All drives in a system are installed in a stack of drive bays at the front of the case. The system shown in Figure 1-12 has two hard drives and one optical drive installed. These three drives are also shown in Figure 1-17.
The larger hard drive is a magnetic drive, and the smaller hard drive is a solid-state drive (SSD). Each drive has two connections for cables: The power cable connects to the power supply, and another cable, used for data and instructions, connects to the motherboard.
Figure 1-17 Two types of hard drives (larger magnetic drive and smaller solid-state drive) and a DVD drive
The power supply. A computer power supply, also known as a power supply unit (PSU), is a box installed in a corner of the computer case (see Figure 1-18) that receives and converts the house current so that components inside the case can use it. Most power supplies have a dual-voltage selector switch on the back of the computer case where you can switch the input voltage to the power supply if necessary—115 V is used in the United States and 220 V is used in other countries. See Figure 1-19. The power cables can connect to and supply power to the motherboard, expansion cards, and drives