Some small stuff - like cellphone chargers - are clever enough to adapt to the voltage they're connected to and will do just fine.
Stuff that isn't will overload and be destroyed.
You'll fry it
'Voltage' is electromotive force, and the 'Watt' is a unit of power. You can plug a 240 watt appliance (light, toy, radio etc) into a 120 volt socket as long as the appliance is rated for 120 volt AC operation.
If the supply voltage is Vs and the equipment voltage is Va, then the equipment will work if Va = Vs (equation). But if Vs / Va = 220 / 120 (equation) the equipment will fail.
The appliaance is designed for 110-120 v so if it is fed at 115 v that is quite OK.
Probably not, but I have yet to see a 150 volt appliance as this is a non-standard voltage. If you are referring to a 115 volt appliance then the answer is yes you can as 110/115/120 volts tend to be used interchangeably in practice and are close enough together to not affect operation of the appliance.
You'll fry it
Yes. Circuits in a home are 120 volts but people tend to call them 110 volt circuits. The 120 volts you read on the appliance is the maximum voltage the appliance can handle. The actual voltage you will read at any outlet will range from 110 to 120 volts.
The formula you are looking for is R = E/I.
The pin configuration of the 240 volt receptacle is different from a 120 volt pin configuration. This is a safety factor to prevent the wrong voltage being applied to the wrong devices.
Yes, the two voltages are in the same voltage range.
'Voltage' is electromotive force, and the 'Watt' is a unit of power. You can plug a 240 watt appliance (light, toy, radio etc) into a 120 volt socket as long as the appliance is rated for 120 volt AC operation.
Yes, but you are limited to the amount of current draw the 120 volt load can apply to the adapter.
If the supply voltage is Vs and the equipment voltage is Va, then the equipment will work if Va = Vs (equation). But if Vs / Va = 220 / 120 (equation) the equipment will fail.
The appliaance is designed for 110-120 v so if it is fed at 115 v that is quite OK.
No, a 240 volt device runs on 240, and a 120 volt device runs on 120. Attempting to run a device on incompatible voltage results in damage.
Probably not, but I have yet to see a 150 volt appliance as this is a non-standard voltage. If you are referring to a 115 volt appliance then the answer is yes you can as 110/115/120 volts tend to be used interchangeably in practice and are close enough together to not affect operation of the appliance.
120/240 volts is the working voltage in North America.