I've been looking for electric plug adapters, and it seems like all the travel kits have only ungrounded adapters. My laptop has a grounded (3 prong) plug, and I'm wondering if it is possible/safe to use an ungrounded adapter with it. I've seen some that accept 3 prongs as input and fit a 3-prong UK plug, but the 3rd (upper) output prong that goes into the UK wall outlet is just a plastic thingy. Do I risk frying my laptop (or myself) if I use this? I'm particilarly concerned because of the high voltage used in the UK. The transformer for my laptop is 100-240V, 50-60Hz, so all I need is an adapter. I could find a grounded one, but they are more expensive, plus I'd have to order it online and pay shipping.