I have a question related to electrical load. Electrical/electronic devices such as laptop, tablets often come with SMPS. Say my laptop is rated to consume 90 watts at full load and 10 watts at idle. But my question is related to how much electricity will it consume if laptop is completely turned off, but it's walwart is still hooked to the AC line? Does it still consume electricity if it's just connected to the line without being switched on? Thanks for your help in advance.