P1.4 - AQA GCSE Physics Unit 1 - Overview

P1.4	Methods we use to generate electricity Various energy sources can be used to generate the electricity we need. We must carefully consider the advantages and disadvantages of using each energy source before deciding which energy source(s) it would be best to use in any particular situation. Electricity is distributed via the National Grid. Candidates should use their skills, knowledge and understanding to:
	■ evaluate different methods of generating electricity	Candidates should be able to evaluate different methods of generating electricity given data including: start-up times, costs of electricity generation and the total cost of generating electricity when factors such as building and decommissioning are taken into account. The reliability of different methods should also be understood. Knowledge of the actual values of start-up times and why they are different is not needed, but the implications of such differences are important.
	■ evaluate ways of matching supply with demand, either by increasing supply or decreasing demand	Candidates should be aware of the fact that: of the fossil fuel power stations, gas-fired have the shortest start-up time. pumped storage systems have an advantage that they can meet peak demand, and store energy for later use.
	■ compare the advantages and disadvantages of overhead power lines and underground cables.

There are two sections to this part of the syllabus:

P1.4.1 - Generating electricity

P1.4.2 - The National Grid

There is also a page suggesting practical experiments that should be carried out during the study of this section.