how many volts does a gas dryer use
I suspect that you are referring to a 110 volt electric dryer (as opposed to a gas dryer which generally IS 110 volts). Electric dryers use a heating element to dry the clothes. These elements are just like a think piece of wire and get really hot so that when the dryer blows air across the wire, the result is warm air. With these types of dryers, the higher the voltage, the lower the current draw. Ohm's law states P=V*I or Power=Volts x Current. Based on that rule, you can attain the same amount of power at 1/2 the current if you double the voltage. For example, to achieve 110 watts of power at 110 volts, the current draw would be 1 amp. 110 watts = 110 volts * 1 amp.