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Heat Pumps

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HeatherS | 02:18 Sat 17th Sep 2005 | Science
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An electricallu-powered heat pump can deliver more energy than it draws from the power line without violating the Principle of Energy Conservation. How does this happen?
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the heat pump takes energy (heat) from the exterior, as well as energy from the power line
10:59 Tue 20th Sep 2005

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