Why are there two black wires connected to the bottom of my three-way switch? - Home Improvement Stack Exchange

I am installing a new 3 way switch. When I open up the existing three way I see two back wires connected that the bottom, one black in the top and one white at the top. Can someone advise what the

Replacing a switch to an outlet, not sure about two black wires

radiant® Two Single-Pole Switches, Gray, Retail Pkg

radiant 2-in-1 Combination Switch, Single-Pole

Identifying Wires on Your Old Switch – Brilliant Support

SWITCHES W. C. “Buster” Hounshell Spring ppt download

Replacing switch: three black wires???

electrical - What's the proper way to replace a wall switch with

LV/MV power substation equipment and wiring requirements

Replacing switch: three black wires???

Does Your Gadget Need a Plug Adapter or Transformer?

Echo vs. Echo Dot: Which Alexa device should you buy?

Leviton 15 Amp Single-Pole Double Switch, Ivory R51-05224-2IS