> you didn't magic those 3W out of thin air. No magic, but you are pulling those 3W out of the outside air. You can use the industry term 'Co-efficient of per

> you didn't magic those 3W out of thin air. No magic, but you are pulling those 3W out of the outside air. You can use the industry term 'Co-efficient of performance' to avoid any possible ambiguity, but it's just the same thing with a different name.