You cannot use a 220v appliance to a 120v outlet.
Ummm yes ? If your talking about a wall outlet yes you can have 120v dc but not at an outlet
No you cannot plug a 100v into a 120v outlet, it will fry whatever the product you are plugging up.
You don't unless it shows a dual rating on the appliance.
In the US on an 120v 15a outlet it's the short slot
Some appliances may work, but I imagine most would either blow a fuse or just burn out. Definately not advised unless you use a transformer. With the right transformer everything should work fine.
UK is 220v
Yes, assuming the wall outlet produces 120V 60 Hz at at least 4 watts.
110 Volt is the nominal standard used in homes. Appliances are rated at 120 volts as a safety measure, as the voltage can fluctuate between 110v and 115v. Appliances rated in this manner will require voltages higher than 120v in order to sustain damage. Might call it a safety net for appliances.
you get an adapter
Yes, no problem at all.
Less current is needed
Yes. It's functionally the same.
yes ofcourse they both are the same
You will burn up your appliance!!!!!
Maybe you have a 'brownout', vs. a blackout. Brownouts are the result of undervoltages. i.e. 90v instead of 120v. This can cause lights, etc. to work more dimly than usual, and some appliances may work while others need the actual 120v. Another possibility is that you lost only half of your split single phase service. This would cause all 120v appliances connected to the good 'half' to work normally. The 120v appliances on the other 'half' would not work, and all 240v appliances would not work.
Don't be stupid. No.
If you need to ask, you should have someone who knows how do it....
In the US, standard household receptacles are 120V, but historically they used to be called 110V. So the two are the same thing - at least in the US. Depending on the age of the electrical device the nameplate may say: 110v 115v 117v 120v and they all are referring to a standard household receptacle.
No, different pin configurations.
yes. but DO NOT do it the other way.