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7.3 Induced potential, transformers and the National Grid (HT only)

7.3 Induced potential, transformers and the National Grid (HT only)

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Question 1

An engineering student is designing a miniature piezoelectric energy-harvesting system to power a remote wireless sensor.

  • The piezoelectric element generates an alternating potential difference of 0.40 V0.40\text{ V}0.40 V.
  • The sensor's power-management circuit requires a minimum input potential difference of 5.0 V5.0\text{ V}5.0 V to activate.
  • The step-up transformer designed for this system has a secondary coil with 1200 turns1200\text{ turns}1200 turns.

Calculate the number of turns required on the primary coil of this transformer to achieve the required voltage step-up.

[2]
Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

2 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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