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| Alternative energy (2) | |
| Atomic energy (50) | |
| Chemical energy (2) | |
| Electrical energy (154) | |
| Kinetic energy (1) | |
| Potential energy (2) | |
| Radiant energy (7) | |
| Renewable energy (272) | |
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| Sustainable energy (17) | |
Before every contraction, the potential energy trapped in chemical bonds within cardiac muscle cells is released and converted into the mechanical power of the heartbeat.
Engineers estimate that the microbial battery can extract about 30 percent of the potential energy locked up in wastewater.
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