Why is the laptop charger thing (transformer) making a noise?
44045
Why do some AC adapters and power supplies generate a whining noise, and what can I do about it?
4007
Why is a laptop power supply output voltage different from its battery?
23911
Notebook computer battery says: plugged in but not charging with no further information. Is the battery bad already?
51576
How to detect when laptop power cable has been disconnected?
12971
What is the reason for this pattern of noise in electric kettles?
1850
Should I disconnect my MacBook Pro's power cord when the battery is fully charged?
72224
what is beeping in my house?
9951
Can I charge my laptop with a charger that has different specifications?
81094
Buzzing power supply
113162
What is it that kills laptop batteries?
14714
How do I protect my laptop from power surges?
100484
Laptop surface vibrating because of ungrounded adapter
91384
There appears to be a poltergeist in my speakers (no, really)
31044
CPU sounds beep loud When It's start
131533
Laptop (Asus x555u) screen turns off as soon as you remove the power cord
101147
Leaving laptop plugged in all the time
2140
Why are the transformer windings in series with line and load in this circuit?