Amp Nerd

Copper-clad aluminum cable contains an aluminum core with a copper outer layer.

A connector current rating is tied to conditions such as conductor size, ambient temperature, and how many contacts carry current.

A wall outlet with USB charging contains a power converter as well as ordinary receptacle contacts.

An outdoor receptacle and its weather cover perform different jobs.

A power cord can be damaged by crushing even when its outer jacket has no obvious cut.

Wire color helps identify a conductor, but it does not prove how that conductor is connected or whether it is safe to touch.

A wall switch turning a lamp off does not establish that every conductor at the fixture is deenergized.

A three-light outlet tester can reveal several common wiring problems, but a correct-looking pattern is not a complete electrical inspection.

The wider blade on a polarized US plug helps preserve the intended line and neutral orientation.

A wire entering the back of an outlet does not identify one single connection method.