Induced potential, transformers and the National Grid (physics only) (HT only) common mistakes

Common mistakes

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a step-up transformer on the National Grid and the objective to calculate the current drawn from the input supply to provide a particular power output.

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a step-down transformer for a low-voltage device and the objective to apply the equation linking potential differences and turns to current and power transfer.

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a student comparing motor and generator effects and the objective to relate transformer calculations to the advantages of power transmission at high potential differences.

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a calculation using primary and secondary coils and the objective to apply MS 3b and MS 3c when using transformer equations.

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a bar magnet and plotting compass practical and the objective to apply MS 1c, MS 3b and MS 3c when linking transformer calculations to power transmission.

• National Grid transformer reasoning: avoid magnetic field...

  Treating magnetic field direction and force direction as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Transformers (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to recognise that transformer equations are given on the Physics equation sheet.