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A wave energy buoy is a device which converts wave energy into electricity. The ain components are a copper coil, a magnetic shaft, a fibreglass container and a cable. The coil in the buoy is floated on the seabed. The buoy is 4m in height. The device is 35m above the seabed and 1.5-3km from the shore. Each buoy is 35m between them. The device works as follows. First, a wave oscillate. This causes the magnetic shaft to reciprocate. When the shaft moves through the copper coil. The coil induces an electric current. The device has a many benefits. The most important is that the device needs no fossil fuels. Energy is renewable. The devce has a few disadvantages. The most important is that the device needs 500 buoys and could damage ships.

The 'ain' (zjadles tu 'm') components are a copper coil, a magnetic shaft, a fibreglass container and a cable.
The device works as follows. First, a wave oscillateS. This causes the magnetic shaft to reciprocate. 'When the shaft moves through the copper coil' (tu brakuje reszty zdania).
The device has 'a' (niepotr) many benefits.
The 'devce' (ortog) has a few disadvantages.