Energy Efficiency

 What is energy efficiency???

There is a "main energy" a device is trying to create. 

For a hair dryer - it is heat and wind
Then there are other energies that are there, but are not the main job of the device. 

(Ex: the actual spinning of the fan doesn't dry your hair - the wind it creates does. The sound that you hear isn't drying your hair, that just happens "on accident"). 

When more energy goes to the main energy -- it's more efficient

When less energy goes to the main energy -- it's less efficient

Energy Transformations

Energy can transform into different types! Energy is never created or destroyed. Therefore, if something "lost energy" it just means that the energy went to a different object or into the air. Here are some energy transformations:

Practice: What device do you think this is showing?

Energy

 

What is Physics?

 What is physics???