Electrical energy.
WiFi uses electromagnetic waves in the microwave band, around 2.4 GHz or 5 GHz.
yes it does and yes you can use your wifi at your home
Radios use eletrical energy
Yes it can use wifi and there is even a way for it to be a wifi hot spot.
Wifi password recovery is an app that you can use in recovering your wifi password.
Yes, you can use the Pou when you do not have wifi.
potential energy
kinetic energy
Yes it is possible to use a Netgear wifi router on a smartphone. Smartphones have a wifi receiver that it can be used for wifi repeating or wifi giving.
No, emulators of any kind may not get WiFi. You should simply buy a DS, or else you will not get the full thrill of a game.
WiFi usb adapter is a WiFi card.
Absolutely no. Its for good use, no matter what kind of downloads you're having.