The laptop I used for the test was a reasonably old Compaq and the charger is not the original one which came with it (the original died a few years ago). I leave my laptop charger almost constantly plugged into the electrical socket in the wall, but for the purposes of the test I connected it through the Individual Appliance Monitor as shown in the picture.
- I checked the power consumed by the laptop charger when there was no laptop attached and like the phone charger it was consuming 0 watts.
- I waited until the laptop battery was well drained and then I plugged it in. The charger immediately started to consume about 63/64 watts of power.
- I put the laptop into sleep mode, but the power consumption of the charger did not decrease (presumably because it was still busy charging the battery). After 2 hours the power consumption gradually decreased to 1/2 watts but not to 0. I assume that this is because the laptop is still consuming power in sleep mode. To eliminate all power consumption I would need to either unplug the laptop or else put it into hibernate mode.
- The charger consumed roughly 0.05 KWh to charge the battery fully. At current electricity prices in Ireland this would cost slightly less than a cent.
- When I woke the laptop from standby the consumption went back up to 24 watts. I assume this is because the charger is providing live power to run the laptop, but not needing to charge the battery.
GOOD RESEARCH
ReplyDeleteI WILL ALSO DO SAME
nice info!
ReplyDeletehow you calculate the power of charger. plz reply me at
hamzah2shahid682@gmail.com thanks
Hamaza - I used the following product http://www.currentcost.com/product-iams.html but there are several alternative available. Brian
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