One for each outlet. If it is a duplex outlet, that would mean two.
If you're asking how much power can be used in a single outlet, that would depend upon the branch overcurrent protection, the distance to the panel and what other loads are already on other receptacles on that branch.
It is certainly possible to plug a "power strip" into a receptacle and add as many rechargers as you want to, until the circuit breaker on the strip pops or the fuse or circuit breaker at the panel trips.
It is generally a violation of fire code to plug another power strip or extension cord into a power strip.
No reason not to as long as the wall outlet is the correct voltage. most are designed to be plugged into a 110v outlet.
It is plugged into a wall outlet.
Not unless it is plugged into a wall outlet.
A fear of wires, plugs or anything that can be plugged into a wall or outlet.
If it is plugged in yes.
yes
First, check if it is plugged into the wall outlet.
You don't. Sorry, it'll have to be plugged into a wall outlet.
If your phone system is a PBX then yes you can plug it on the same outlet where a UPS is plugged. You can even plug your PBX system to the UPS so when there's a power failure you can still have few minutes source to power your phone system.
NOCan however be powered by a 120/ to 12 volt DC power supply plugged into wall socket. (Ensure the power supply has sufficient current rating to run the subwoofer)
Yes portable radios pick up the same stations as a regular radio there just portable instead of having to be plugged into a wall outlet.
Yes and Very Possible! Bad connections cause heat so the outlet may be defectice. The outlet or the supply line may also not be rated to supply the current (amperage) required by the heater.