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The value of timers

Recently I used an electrical meter to measure how much electricity various devices use. The big surprise for me was a laptop charger that pulls current even when the battery is fully charged. Since normal behaviour is to plug in something to charge, then return when you need it next or when you remember, there might be a day or more when something like this is plugged in and pulling small but unnecessary watts of power. I've tried to lessen this by using a digital electrical timer that includes a countdown function. I know roughly how many hours it takes to charge the battery, and I set the countdown for a little bit longer than this. If I don't get a chance to unplug the charger the moment the device is charged, it's ok - the timer shuts off the power for me.

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