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P8.2 Powering EarthExam-style questions
Name ..................................................................... Class .................. Date .....................
1 The chart shows the methods used to generate electricity in the UK in 2013.
a Calculate the percentage of electricity that was generated from ‘other fuels’.Show your working.
Percentage: % (2 marks)
b i Describe what is meant by a renewable energy source.
(1 mark)
ii Name two examples of a renewable energy source.
Name ..................................................................... Class .................. Date .....................
4 The National Grid ensures that electricity is supplied to all parts of the country.a Suggest two factors the government considers when building a new power
station to supply the National Grid.
1
2 (2 marks)
b Explain how transformers are used in the National Grid, and why they help to improve efficiency when transferring energy.
(6 marks)
c A transformer has an input voltage of 230 V and an output voltage of 1.5 V.Determine the current in the secondary coil if the current in the primary coil is 1 mA.Give your answer to 2 significant figures. Use the equation:
potential difference across primary coil × current in primary coil = potential difference