| 1 | Aluminium requires lots of expensive electricity to produce. | |
| 2 | The trolley bus picks up current from an overhead wire. | |
| 3 | Movement produces kinetic energy, which can be converted into power. | |
| 4 | The solar cell can convert the energy of sunlight into electric energy. | |
| 5 | The technique turns the banana peel carbon into electricity. |
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