Electronics Specs Explained

AA and AAA are slim everyday cells, C and D are big ones for high drain, a 9V is a box with snap terminals, and a coin cell's number gives its size in mm.

A Chromebook is a laptop that runs Google's ChromeOS instead of Windows or macOS, works through web and often Android apps, and gets updates to a listed date.

Data center GPUs such as the NVIDIA H100 trade display outputs and fans for more memory, ECC and server cooling; gaming cards like the RTX 4090 drive monitors.

DDR5 runs at higher transfer rates and lower voltage than DDR4, but the two are not interchangeable; your motherboard and CPU decide which one you can use.

A desktop processor must match your motherboard's socket first; then the tier, the core count and the letters ending the model name tell you what you get.

USB-C is the plug shape, and Thunderbolt and USB4 are the links behind it; a Thunderbolt dock guarantees more bandwidth, while plain USB-C docks vary more.

A drive enclosure turns an internal drive into an external one; match it to the drive's size and interface, and pick a link speed the drive can actually use.

A wired headset needs no charging, a wireless one runs on a battery over a USB receiver or Bluetooth, and the mic style decides how clearly others hear you.

HDMI cables are not sold by version number; for HDMI 2.1 features like 4K at 120Hz or 8K at 60Hz, buy a certified Ultra High Speed HDMI Cable, rated to 48Gbps.

HDR10 is the base format every HDR TV plays, while Dolby Vision and HDR10+ add scene by scene instructions; the TV, player and show must share a format.

Pick the app ecosystem first, then the screen size, storage and whether you need cellular data, a pen or a keyboard; the rest follows from how you will use it.

A KVM switch lets one keyboard, monitor and mouse control two or more computers; match its port count, video link, resolution and refresh rate to your setup.

A tiller pilot pushes a sailboat's tiller, a wheel pilot turns the wheel, and an inboard drive works below deck on larger, heavier boats.

A single router covers a home from one spot, while mesh spreads several units under one network name; mesh suits larger or multi-story homes.

A 1GbE card fits most home internet plans, 2.5GbE runs faster over Cat5e or Cat6, and 10GbE pays off for NAS and workstation transfers.

A mid tower fits a standard ATX board and suits most builds, a full tower adds room for big boards and cooling, and small cases trade space for size.

A basic PDU adds outlets, a metered PDU shows the load, a monitored PDU reports over the network, and a switched PDU turns outlets on and off remotely.

Lumens tell you how bright a projector is, and the throw ratio how far from the screen it sits; divide the distance by the image width to get it.

Wattage is how much power a PC power supply delivers, while an 80 Plus rating such as Gold says how efficiently it does it; they are separate choices.

A gear driven wheel is the cheapest, a belt driven wheel is smoother, and a direct drive wheel bolts the rim to a large motor for the strongest feedback.

A RAID card builds drive volumes on its own chip, while an HBA just connects drives and lets the OS or ZFS manage them; ZFS systems call for an HBA.

Refurbished grades describe looks, not how a device works; each seller sets its own names, so compare the wording, battery rule, warranty and return window.

Rack height is counted in rack units (U) of 1.75 inches, the standard rack is 19 inches wide, and 42U is the common full-height cabinet; depth varies.

SFP modules carry 1 Gbps, SFP+ 10 Gbps and SFP28 25 Gbps in the same small cage, while the wider QSFP family bundles four lanes for 40, 100 Gbps and more.