 | | 4.1. Energy and Power |
 | | 4.2. Efficiency |
 | | 4.3. Conversion of Electrical Energy into Heat |
 | | 4.4. Conversion of Electrical Energy into Mechanical Energy |
 | | 4.5. Conversion of Electrical Energy into Light |
 | | 4.6. Conversion of Electrical Energy into Chemical Energy and Chemical Energy into Electrical Energy |