Three and four mark questions

These are similar to one and two mark questions but you will be expected to write in more depth for three and four mark questions.

Three and four mark questions usually require longer answers.

Edexcel questions courtesy of Pearson Education Ltd.

Sample question 1 - Foundation and Higher


Explain how transformers are used to improve the efficiency of power transmission in the National Grid. [3 marks]

Step-up transformers increase the voltage [1]. This reduces the current [1], which reduces heat loss in the transmission wires [1].