1.1. A wind turbine converts kinetic energy in the wind to electrical energy, which it then transfers to the National Grid.

The wind farm in Figure 5 below contains 5 wind turbines, each with an average power output of 3 MW.

Figure 6

Calculate the total energy generated by the wind farm in 30 minutes.

Show all your working.

1.2. In a single turbine, the current through the generator is 450 A.

Calculate the output voltage of one turbine.

1.3. A step up transformer is used to increase the output voltage to 132 kV for transmission.

Explain why the voltage is stepped up in this way.