With induction charging you're trying to charge a battery and unfortunately producing heat in the process which is unwanted and entirely a waste.
With induction stoves pretty much all the electricity is converted to heat in the bottom of the pan which is exactly what you want. A minor portion is lost elsewhere in the circuitry but not much in the grand scheme of things.
Efficiency refers to the ration between what you put in towards a goal and how much of it actually turned into that goal. Things that produce rhat with electricity tend to be 100% efficient because any waste usually happens to be heat.
An induction stove certain shouldn't have lower efficiency compared to a regular electric stove so maybe check if it's not a local issue.
