What does an HDMI cable mainly carry?
AnswerDigital audio and video
HDMI stands for High-Definition Multimedia Interface.
Tech · Facts & stats
Cable facts & stats
7 fact-checked facts about cables, undersea networks and cable-powered transport, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which connector is standard for wired Ethernet networking?
AnswerRJ45
Ethernet cables use the eight-pin RJ45 connector.
Going deeper
Which metal is most commonly used as the conductor in household electrical wiring?
AnswerCopper
Copper conducts well and is far cheaper than silver.
Which USB connector is reversible, so it plugs in either way up?
AnswerUSB-C
USB-C is symmetrical, unlike the older USB connectors.
Coaxial cable gets its name from what feature?
AnswerIts inner conductor and outer shield share the same axis
'Coaxial' means sharing a common axis.
Expert level
Which ship laid the first lasting transatlantic telegraph cable in 1866?
AnswerSS Great Eastern
The Great Eastern was the only ship big enough to carry the whole cable.
Which physical principle keeps light trapped inside the core of an optical fiber?
AnswerTotal internal reflection
Light hitting the core's boundary at a shallow angle reflects back inside.
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