Describe the mains supply of electricity. 0 1 . 1 Tick two The current one way and then the other. The current flows in one direction only. The frequency is 65 Hz. The frequency is 50 Hz. The frequency is 45 Hz. (2 marks) Name the two in the cable connected to a plastic hairdryer. 0 1 . 2 Tick one box. neutral and earth neutral and live live and earth (1 mark) What is the potential difference between the neutral and the earth? 0 1 . 3 Choose from the box. one (1 mark) The National Grid is a nationwide network of transformers and 0 2 cables. Describe what step-up transformers are used for in the National Grid. 0 2 . 1 (2 marks) Explain why the energy in the National Grid is transferred efficiently. 0 2 . 2 (2 marks)
0 1 . 1 Describe the mains supply of electricity. Tick two The current one way and then the other. The current flows in one direction only. The frequency is 65 Hz. The frequency is 50 Hz. The frequency is 45 Hz. (2 marks) 0 1 . 2 Name the two in the cable connected to a plastic hairdryer. Tick one box. neutral and earth neutral and live live and earth (1 mark) 0 1 . 3 What is the potential difference between the neutral and the earth? Choose one from the box. (1 mark) 0 2 The National Grid is a nationwide network of transformers and cables. 0 2 . 1 Describe what step-up transformers are used for in the National Grid. (2 marks) 0 2 . 2 Explain why the energy in the National Grid is transferred efficiently. (2 marks)
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