Andrian Cheng

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.

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.

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.

An impact driver takes 1/4 inch hex bits and drives screws, while an impact wrench takes square drive sockets and turns big nuts and bolts with more torque.

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

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.

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.

The alto sax is pitched in E flat and the tenor in B flat; Yamaha points beginners to the alto as easier to play, and its fingering carries over to every sax.

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.

A belt drive turntable turns the platter with a belt from an offset motor, a direct drive puts the motor under it, and a phono preamp boosts the signal.

The plug shape (USB-A or USB-C) and the speed (USB 2.0 up to USB 80Gbps) are separate things, so check both, plus the wattage a USB-C cable is rated for.

UL Listed and ETL Listed both mean an OSHA recognized lab tested a product to a safety standard; the two marks differ by lab, not by standard.

Acoustic guitars make their sound with a hollow body and electric guitars need an amplifier; size follows the player's reach, and electric is our top type.

A mixer combines microphones and instruments into one output; count every source you will plug in at once, then add spares, to know how many channels you need.

A brass mouthpiece name like 7C pairs a number for cup diameter with a letter for cup depth, but each maker runs its own scale, so read its chart.

Mirrorless cameras swap the DSLR's mirror and optical viewfinder for a live electronic view; a megapixel is one million pixels, and 7 MP covers an 8x10 print.

A circular saw is the portable all-rounder, a miter saw makes accurate repeat crosscuts, and a table saw rips long boards and sheets fed into the blade.

The Bb clarinet is the standard instrument for students and bands; reeds run soft to hard on a scale of about 1 to 5, and beginners often start at 2.0 or 2.5.

A dash cam records the road so you have video of what happened; the main choices are how many cameras it has and whether it can watch the car while parked.

A digital piano has 88 weighted, touch-sensitive keys like an acoustic piano; hammer action copies the feel most closely, and semi-weighted keys feel lighter.

Coated heads sound warmer and softer, clear heads brighter with more attack; a single-ply head rings longer, while two plies add durability and cut overtones.