e.g. If a phone charger is plugged into an outlet yet has no phone connected to be charged, why does it draw power?
In: Technology
Sometimes they contain capacitors that help to change the voltage coming from the wall to match what you need for your phone.
When you plug it in, the capacitors accept charge from the wall. To keep you safe when you unplug it from the wall, the engineers added small resistors to bleed off the capacitors.
The resistors are connected all the time, so even when your phone is not hooked up, they still bleed off the capacitors and those capacitors get immediately refilled by the wall outlet.
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