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Almost every electrical outlet in the US is a 3-prong outlet. 2-prong outlets have not been widely used in decades. You only see them in older houses where the outlets have not been upgraded. Certainly any hotel you stay in will have to have upgraded their outlets to meet local building codes.
The third prong in the US is a ground (its the half round one). Most low voltage/current appliances do not need to be grounded. So that is why you will see two pronge plugs, but they will fit into a three prong outlet.
Hi, Hal, the third prong is an earth prong. It depends on where you are staying and how old their electrics are on whether they have two pin or three pin outlets. You can still use your existing travel adaptor in three pin outlets, it will just mean that the appliance is grounded to earth. Since the voltage is lower over here this isn't such an issue, but I would be careful using an appliance in the bathroom (unless there is a circuit breaker which there should be) because the damp environment can reduce resistance which means that if you were to get a shock, the current that would pass through you would be greater than in a higher resistance environment with the same voltage (I'm sure you already know this anyway). Amanda
Baxter sent me a transformer to convert UK voltage to US.