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# Useful Energy

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### Useful Energy

1. 2. <ul><li>To know what useful and wasted energy are. </li></ul><ul><li>To know and explain how energy can wasted. </li></ul>
2. 3. <ul><li>If all energy transfers were perfect, the </li></ul><ul><li>useful energy output from an appliance </li></ul><ul><li>would be the same as the input energy . </li></ul><ul><li>In practice, however, some wasted </li></ul><ul><li>energy is nearly always produced during </li></ul><ul><li>the conversion . </li></ul>
3. 4. <ul><li>The Total Energy Input = Total Energy Output </li></ul><ul><li>Energy is not created or destroyed </li></ul><ul><li>The Output Energy is always in two </li></ul><ul><li>or more forms which can be Useful </li></ul><ul><li>or Wastage Energies. </li></ul>
4. 5. <ul><li>Refer to the energy animated diagram number 3 </li></ul>
5. 6. <ul><li>What is useful energy? </li></ul><ul><li>Is energy transferred in the form and where it is desired. </li></ul>
6. 7. <ul><li>Is the energy that is not usefully transferred or </li></ul><ul><li>transformed. </li></ul><ul><li>Refer to example of energy wasting in no. 6 </li></ul>
7. 8. <ul><li>What is useful energy? </li></ul><ul><li>http://www.youtube.com/watch?v=ywJ3WGpf0hw&NR=1&feature=fvwp </li></ul>
8. 9. <ul><li>Refer to Energy animated diagrams on page 4, 5 and 6. </li></ul>
9. 10. <ul><li>http://www.yteach.co.uk/page.php/resources/view_all?id=Domestic_Tungsten_electrical_energy_trees_candle_thermal_energy_chemical_energy_light_energy_conservation_kinetic_energy_electrical_energy_Converting_energy_t_page_7&from=search </li></ul>
10. 11. <ul><li>Give answers to questions a and b on page 246 and question c on page 247. </li></ul><ul><li>Do the summary questions 1, 2 and 3 on page 247. </li></ul>