Does a laptop recharger waste electricity when the laptop is not connected?

All we need is an easy explanation of the problem, so here it is.

I have a laptop with a recharger (also known as an AC adapter), this is how it looks like:

Does a laptop recharger waste electricity when the laptop is not connected?

When I disconnect my laptop from the charger, does it (the charger) still consume (waste) electricity?


I am trying to do math, how many kW I waste every year to keep my adapter plugged in the whole time.
I tried to read how much watts does it take, but I am not good with that kind of stuff, so here is some info:

INPUT : 100-240V~50-60Hz 1.5A(1,5A)

OUTPUT: 19.5V(19,5V) — 4.62A(4,62A)

Does this info help to do the math?

There is 8760 hours in year.

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Yes. Generally anything with a transformer in it will draw at least some power when plugged in. See here for more details on the types of devices that will typically use power even when off. The only thing that will keep a device from drawing standby power is if you actually break the circuit that the device is plugged into.

Method 2

Yes, not a whole lot but over time it does add up. It can also wear out the transformer sooner.

See for more info.

Method 3

I just did a test with my P3 watt meter. One old DELL adapter (10+ years, for Latitude P3 650) uses 1.3W while the laptop is not connected. However, a recent HP adapter (2+ years) uses 0 W (at least from P3 watt meter reading).

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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