This is generally called the power factor - if you have a purely inductive (your coil example) or capacitive load have a pf approaching 0. A purely resistive lo

This is generally called the power factor - if you have a purely inductive (your coil example) or capacitive load have a pf approaching 0. A purely resistive load is 1. Phone chargers and similar usually have pretty bad pf - but not because of the above, but because they are designed to take energy in short pulses (they call this a non-linear load). Energy isn't really consumed by this, but it does affect the way the distribution system is designed and operates (which may involve downstream energy waste).