I have an electromagnetic radiation detector that I've been playing with recently, going around the house and testing various appliances, and I noticed something weird.
When I charge my laptop (or phone or tablet, for that matter) they emit electromagnetic radiation. When I don't charge them, they don't emit anything. Even if I use them.
I would expect the laptop to emit something while on battery power, but it doesn't. And I don't understand why it emits only when I charge it since the charger is a few feet away from the laptop.
Is there something in the laptop battery that emits that electromagnetic field? Why doesn't it do the same when the laptop is not charging?
I'm playing with a cheap DT-1130 Electromagnetic Radiation Detector