A transformer can be used to change the voltage to an appliance. The voltage rating of the transformer should be right for the voltages used, and the current rating of the transformer should not be less than the current drawn by the equipment.
Yes provided that you use a transformer that will transform 110 to 220/240. Without the transformer you will blow your equipment. You can take a USA appliance and go to Europe and other places that use 220/240 and use it but only if you have a transformer that is in range with the power consumption of the 110 equipment. Most small/portable electrical equipment like computers, tablets or phones bought in the USA are now coming with dual voltage 110/240, so there is no need for transformers. If you equipment does not says 120/240 or 110/220 you WILL need the transformer.
Do you mean voltage? Use a transformer with a 2 to 1 winding ratio.
Use a step-up transformer from 110 volts to 220 volts. Try getting one at Home Depot or SEARS.
No a 230 volt appliance should not be pluuged into a 110 volt socket (And vice versa) you need to buy a converter that can be plugged into the 110 volt outlet then the appliance can be plugged into the converter.
A transformer that reduces voltage is classed as a step down transformer.
Not unless you have a 110 volt supply to plug it in to. The standard General Power Outlet in Australia is 240 volts AC at 50 Hertz.
You would have to run new wires to obtain 240 volts or use a step-up transformer.
No, they will not perform properly.
Yes.
AC, just use a transformer. DC, it's more complicated. You need to build or buy an inverter which is an electronic circuit which will chop the 110 volts into a high frequency square wave, run it through a transformer, then rectify the higher voltage AC back to DC.
No adapter is needed, 110 and 115 volt are interchangeable.
AC - use a step-down transformer. DC - simplest but most wasteful, use a dropping resistor (in series). Otherwise it is costly.