I have an amp meter in my multi-tester. I know it to be accurate. I recently bought a wireless door bell set. Plug in receiver, battery operated transmitter. The receiver says on the label that it consumes 2 watts. However when I measure it with my Amp meter it says .075 amps (at 220V) which is abut 17 watts. The two watts is probably accurate because it does not get hot. By contrast a 17 watt light bulb would get quite hot after only a few minutes. What is going on? Does anyone have any idea?