Generally speaking, the ratio of how much work a component or apparatus does to the amount of energy or power it uses.
Generally speaking, the ratio of how much work a component or apparatus does to the amount of energy or power it uses.
Generally speaking, the ratio of how much work a component or apparatus does to the amount of energy or power it uses.
Generally speaking, the ratio of how much work a component or apparatus does to the amount of energy or power it uses.