alternating current
There are many countries that use 110v electrical outlets. The countries are Anguilla, Belize, Cuba, Dominican Republic, French Polynesia, Guam, Haiti, Honduras, Jamaica, Panama, St, Kitts and Nevis, Taiwan, and Virgin Islands.
All the lights and electronic equipment that use wall outlets in your home.
Canada and the United States (along with most of the rest of North America and some of South America) use a connector standardized by the National Electrical Manufacturers Association. The outlets feature two slotted inputs for the electrical current and one hole for the ground.
A Corvette
Assuming this is not an office of a place where lots of the outlets will be used to power items that draw lots of current on a 15 amp circuit wired with 14/2 wire I would limit it to no more than 10 outlets and lights combined. On a 20 amp circuit wired with 12/2 wire I would limit it to a 14 outlets and lights combined. There is no limit in the code. You just use common sense based on what is going to be used on this circuit.
limestone
Yes you may, you can even install them on a 20 amp circuit as long as they are the duplex type.
No. Current does not come from a wall outlet unless the wall outlet is part of a complete circuit.
Technically, they can be on a 15 amp breaker when you use 15 amp outlets. There is a difference. Be sure to check your local code (just call the city building department and tell them you have a code question). some cities require the bedroom outlets to be on an arc-fault breaker.
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
The easiest way to answer your question is to point out that every device you own or use, which you plug into the wall or which contains a battery, makes available to you some use of electrical current. Whatever you use each of those devices for is a use of current electricity.
I would roller it with latex.