Understanding how to approach exam questions helps to boost exam performance. Questions will include multiple choice, structured, using mathematical skills, and extended writing.
Part ofCombined ScienceElectromagnetic induction
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.
Edexcel questions courtesy of Pearson Education Ltd.
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].
