Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

history | excerpt history