To know what useful and wasted energy are.

To know and explain how energy can wasted.

If all energy transfers were perfect, theuseful energy output from an appliancewould be the same as the input energy. In practice, however, some wastedenergy is nearly always produced during

the conversion.

The Total Energy Input = Total Energy Output

Energy is not created or destroyed

The Output Energy is always in twoor more forms which can be Usefulor Wastage Energies.

Refer to the energy animated diagram

number 3

What is useful energy?

Is energy transferred in the form and where it is desired.

Is the energy that is not usefully transferred or

transformed.

Refer to example of energy wasting in no. 6

What is useful energy?http://www.youtube.com/watch?v=ywJ3WGpf0hw&NR=1&feature=fvwp

Refer to Energy animated diagrams on page 4, 5 and 6.

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

1. Give answers to questions a and b on page 246 and question c on page 247.

2. Do the summary questions 1, 2 and 3 on page 247.