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Does leaving my laptop on the adaptor use a lot of Electricity?

This may sound like a really “nieve” question..but really do not know the answer. If I leave my adaptor hooked up to my laptop all the time does it use a lot of electricity? I usually do not turn it on unless I am using it….so it basically sits off with the adaptor still hooked to it….just wondering…..these days we are trying to conserve as much as possible. Thanks in advance…