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

Common mistakes

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a calculation using primary and secondary coils and the objective to state that the generator effect is used in an alternator to generate alternating current.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a bar magnet and plotting compass practical and the objective to state that the generator effect is used in a dynamo to generate direct current.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a steel core electromagnet demonstration and the objective to explain how the generator effect is used in an alternator to generate ac.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a current-carrying wire between magnetic poles and the objective to explain how the generator effect is used in a dynamo to generate dc.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a loudspeaker coil moving in a magnetic field and the objective to draw graphs of potential difference generated in a coil against time.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to an alternator producing an AC output trace and the objective to interpret graphs of potential difference generated in a coil against time.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a dynamo producing a DC output trace and the objective to distinguish ac output from dc output using potential difference-time graphs.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Uses of the generator effect (HT only), then explain how it links to a moving-coil microphone investigation and the objective to apply WS 1.4 when interpreting diagrams and graphs of generator-effect devices.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Microphones (HT only), then explain how it links to a step-up transformer on the National Grid and the objective to state that microphones use the generator effect.

• National Grid transformer reasoning: avoid motors and generators

  Treating motors and generators as interchangeable when answering about National Grid transformer reasoning.

  Fix itInstead, identify the exact Unit 4.7 idea in Microphones (HT only), then explain how it links to a step-down transformer for a low-voltage device and the objective to describe how pressure variations in sound waves are converted into variations in current in electrical circuits.