On Sun, 28 Mar 2021 10:29:10 -0700, Jeff Liebermann
wrote:

On Sun, 28 Mar 2021 01:13:16 -0400, micky
wrote:

How much electricity do these things use when not in use?

1) Laptop power supplies, when the laptop is not on? Is it different
when the laptop is disconnected?

Using my P4460 Kill-a-watt meter, I tried a mixed collection of
laptops and power supplies. Since the laptop is charging the battery
while it is turned off, and I didn't want to wait for the battery to
come to full charge, I simply removed the battery where possible:

Acer Chromebook 14
PS only 0 watts
PS with laptop turned off 0 watts

HP Pavilion dv8263dl
PS only 0 watts
PS with laptop turned off 3 watts

HP Pavilion dv6-1253cl
PS only 0 watts
PS with laptop turned off 0 watts


I doubt it is really zero but a switched mode power supply plugged in
with no load may not be enough to start counting on a Kill a Watt
unless you left it plugged in for a really long time.