Can someone comment if I can keep using a Dyson in the USA even though I bought it in Japan? There is a difference of 10 watt between the two countries.
The problem is voltage does not match on its spec. I have a voltage regulator machine with which I can step down the US's 100V to the Japan-spec Dyson's 100V. I am not sure how well or effective a voltage regulator is. The frequency is okay for the both countries.If the voltage and frequency match up, then yes.
I assume you mean volt in which case yes, it'll be fine.
Well, none of these things are quite as powerful as a vacuum cleaner, but when I moved to the US from Japan I brought a rice cooker, a yakiniku hotplate, and some smaller electronic devices (camcorder, camera, etc) and they all ran fine on US current.
I have a couple of step-down transformers, quite heavy-duty. I never used them, though. If you need one, PM me.
Not necessarily.
It may be 110V but at 50Hz, which wouldn't be a fire hazard, but since US power is 60Hz the vacuum will not run at the same speed.
If it is marked 100-240V 50/60Hz, then yes, it will work.