1. The National Grid
1. How is electricity distributed from power stations to consumers?
...............................................................................................................................................
2. Label the main parts of the diagram below. Use the following keywords to
help you: Power station; Power lines; Overhead cables; Home; 230V; Step
up transformer; Pylon; Step-down transformer
3. What does a step up transformer do? ..........................................................................
4. What happens to the current when voltage is increased? .......................................
5. Why do we use step up transformers? ..........................................................................
6. What is a step down transformer? ................................................................................
7. Why do we need to use a step down transformer? ...................................................
8. What voltage is the electricity used in our homes?...................................................
Checklist
Tick

2. 1 Electricity is distributed from power stations to consumers along the National Grid
2 I can label and identify the main parts of the National Grid
3 For a given power increasing the voltage reduces the current required and this
reduces the energy losses in the cables
4 I know why transformers are an essential part of the National Grid
5 I can compare the advantages and disadvantages of overhead power lines and
underground cables