The diagrams below show the design for a wave-energy machine and its location. Summarise the information by selecting and reporting the main features and make comparisons where relevant.

The first diagram illustrates the design and functioning of a wave-energy machine, which is a tool designed to convert the power of water into electricity. It's one of the principal methods of creating clean energy. As the illustration shows, the machine is divided in two chambers, positioned one on top of the other. Water enters into the bottom chamber, following the direction of waves: the space available is gradually occupied by water, which pushes the air out creating a flow that allows the turbine connected to an electricity generator to rotate, thus creating electrical energy. This type of machine, in order to function properly, can't be positioned everywhere, but only in specific places, as the second diagram shows. There are two location options: the first one, which is also cheaper in terms of installation costs, is to settle the wave-energy machine closer to the shore, where the water is still low. However, despite the advantages regarding costs, this solution unfortunately provides a low output in terms of electricity, since the waves near the shore are smaller and thus less powerful. In order to have larger waves and consequently a higher output, the wave-energy machine needs to be positioned where the water is deeper. Obviously, there is a downside to this, since the costs of installation are higher.