"Let's say you connect (an extension cord) to a floor heater," Martinez says, "the plug melts and it starts ... the fridge to malfunction. AC units use a lot of power to keep your home cool ...

Most brand new cars leave now the factory with USB ports inside the cabin, allowing you and your passengers to charge ...

A power supply for electronic devices. Also called an "AC adapter" or "charger," power adapters plug into a wall outlet and convert AC to a single DC voltage. Computers use multiple DC voltages ...

A device that transfers power to smartphones, tablets and myriad portable devices. USB chargers plug into an AC outlet and provide a USB Type A or Type C socket to cable DC power to the device.