The long thick cables of transmission lines are made of copper or aluminum because theyhave a low resistance.
Light switches are the other electrical installations you might want to handle yourself. The majority of these in homes are what is known as a 'single-pole switch.' They're just as easy to replace as an outlet. Somewhere in your home, you may come across an odd looking switch that makes you stop and wonder. It's likely that this is a three-way switch. They're a little more complicated and used when multiple switches control a single light.
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