Appliances such as computers, stereos, power tools and other hight wattage products usually have the third grounding pin and should be used with 3 pin grounded adapter plugs. No, but first a little terminology. There are two products available to change electric current - one is a converter and the other is a transformer. THere are also two kinds of appliances - electric and electronic. Electric appliances are simple heating devices and those products with universal motors.
Some examples are hot pots, hair dryers and electric blankets.
Electronic appliances are those products with a chip or circuit. Some examples are radios, camcorder rechargers and computers. A converter is designed to be used ONLY with electric appliances such as hot pots and hair dryers. The transformer ais designed to be used with electronic appliances such as camcorder rechargers and radios AND electric appliances. Converters and transformers can either be step down or step up.