That we should be concerned about?
Yes. It is called vampire power.
I however still leave my phone charger plugged in because it is flimsy and prone to kink and stop working.
I would recommend having your charger on a power bar with an off switch if you are concerned with power usage.
Just an itsy bitsy teeny weeny bit.
@SnipSnip Only if it’s wearing a yellow polka dot bikini?
They’re called “wall warts” https://www.sweetwater.com/insync/wall-wart/ ! ! !
Yes they do. Part of the circuit has a transformer whose primary is always electrically active when plugged in even when there is no electrical load on the secondary. It’s mostly dissipated as heat.