In a simplified block diagram of an electric power distribution system, electrical energy moves from the generating station to domestic consumers.
a. (i) Draw a neat, labelled sketch of a typical electric power distribution chain from the generating station to a household socket, indicating the approximate voltage level at each stage.
b. (ii) Describe the role of the step-up and step-down transformers in this chain.
c. (iii) Explain why the secondary winding of the final distribution transformer is connected to the earth at one point.