Does Leaving Laptop Plugged In Waste Electricity. An extension cord only conveys power to the devices plugged into it - if those devices are actually turned on. Many Appliances Use Just as Much Power When Off Always leaving a laptop computer plugged in even when its fully charged can use a similar quantity 45 kilowatt-hours of electricity in a week or about 235 kilowatt-hours a year.
Some cords do suck vampire power even when nothing is plugged into them. Such a setting leads to a very small amount of electricity waste. The electricity an unplugged laptop charger uses is too small to matter.
In some situations its obvious whether leaving something plugged in is wasteful.
It stops charging as soon as it hits 100 and directs the power to your laptop. This means that power. Cell phone charger cords are an example of a cord that does draw power even when it is not plugged into the phone. Yes its true that you could save a tiny amount of electricity by unplugging your chargers but you could save a much larger amount of electricity by looking to heating cooling lighting laundry your computer and other more significant power drains.
