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
Because it’s often a transformer circuit, it’s still inducing a magnetic field and there is still resistance and current moving through the circuit. Voltage loss from the wheatstone bridge, too, most likely.
There’s basically a “circuit” working even if there are no electronic chips in it, and yet things like USB chargers often have actual electronic circuits in them too.
Because of that , they are always (tiny) losses in that circuit, which produce heat and magnetism and cause power to be drawn.
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