Induced transformers

• What is the purpose of transformers in electricity supply?

  To change the potential difference
• What are the two types of transformers mentioned?

  Step-up and step-down transformers
• Why do some students find transformers tricky?

  They think it's more complex than it is
• What is the structure of a transformer?

  • Two coils of wire: primary and secondary
  • Coils are separate, no direct current flow
  • Coils are wound around an iron core
• Why is iron used in transformers?

  Because it is easily magnetized
• What happens when alternating current flows through the primary coil?

  It generates a changing magnetic field
• How does the magnetic field affect the secondary coil?

  It induces a potential difference
• What is required for transformers to work?

  Alternating current
• What happens if a transformer has the same number of turns in both coils?

  The potential difference remains the same
• What does it mean if a transformer is 100% efficient?

  No energy is wasted in the transformer
• What characterizes a step-up transformer?

  More turns in the secondary coil
• If a step-up transformer has twice the number of turns in the secondary coil, what happens to the potential difference?

  It doubles the potential difference
• What characterizes a step-down transformer?

  Fewer turns in the secondary coil
• If a step-down transformer has half the number of turns in the secondary coil, what happens to the potential difference?

  It halves the potential difference
• What will be covered in the next video about transformers?

  • Calculations involving transformers
  • How transformers are used in electrical transmission
• Where can students find questions on transformers?

  In the vision workbook