Compare the amount of heat pumped by the Peltier element in the experiment with the total energy consumed in the experiment. Answer the questions.
We have already estimated the amount of heat that needs to be "removed" from the water
| The amount of energy released when cooling water to the solidification temperature () | |
| Freezing water releases (TeX parse error: Extra open brace or missing close brace) | |
| Total amount to be removed () |
Test power and test time
| Average power used in the test () | |
| Test time () |
Energy used in the test
| Energy used in test () |
How is this knowledge useful to us?
As we have seen, it took a lot more energy to make a tiny juice ice cream than we calculated in theory. This is often the case in other areas of life, as energy transfer is generally not 100% efficient. A good example is the fossil-fuel car, in which a maximum of 40% of the fuel consumed is converted into energy to move the car, and in most cases the figure is even lower. Electric cars are a bit different, with a minimum efficiency of 70%.
In any energy-consuming activity, we should bear in mind that a large part of the energy is not actually used for that activity, but for something else, such as heat. Therefore, it is always worthwhile to consider a large margin for these activities.