This is the point at which the amount of energy coming out of the fusion reactions equals the amount of energy needed to maintain the plasma. (discovermagazine.com)
The employed wife feels that she has expended at least as much energy outside the home during the day as has the husband, and that therefore equal amounts of energy should be expended in the home tasks. (religion-online.org)
«Ideally, the energetic cost of curtailing a resource should at least equal the amount of energy it cost to store it,» Dale said. (sciencedaily.com)