Electromagnetic Induction
Subjects / Additional Science / OCR 21st Century Additional Science A
In this title, we will look at the parts of electromagnetic induction that you may encounter in your GCSE studies. Transformers are often the subject of exam questions. We will consider input and output voltages and their relationship with the turns ratio of input and output coils. We will discuss the difference between step-up and step-down transformers and where each is likely to be used. Next we examine the theory of electromagnetic induction, including the actions needed to induce a current in a conductor such as potential difference. This title also covers generators, and how a coil rotating in a magnetic field can produce an alternating current. Instead of a coil rotating in a magnetic field, some generators, or dynamos, have a magnet rotating inside a coil.
| Author: | Ken Hewitt | Publisher: | GCSEPod® |
| Narrator: | Pauline Addis | ISBN: | 978-1-84906-208-4 |
| Video ISBN: | 978-1-84906-708-9 |
Chapters
- Transformers
- Structure of a Transformer
- Electromagnetic Induction Theory
- Generators and the Rotation of Magnets within Coils
- Voltage in a Conductor
Exam Board Relevance
- Edxcel
- AQA
- CEA
- IGCSE (EdExcel)
- OCR
- SQA
- WJEC
- IGCSE (CiE)
Includes original GCSEPod image art. Additional pictorial images created by Damon Smith
Curriculum and Exam Board Information
Key Issues
Titles
Chapters
- Alternating Potential Difference
- An alternating current in the primary coil produces a changing magnetic field in the iron core and hence in the secondary coil
- Cells, batteries and direct current
- Electricity generation
- Explanation as to how a transformer works
- Force on a current-carrying wire in a magnetic field - simple d.c. Motor
- Force perpendicular to both the current-carrying wire and the magnetic field
- Generation of electricity by rotation of a magnet within a coil or vice versa
- In a step-down transformer the potential difference across the secondary coil is less than the potential difference across the primary coil
- In a step-up transformer the potential difference across the secondary coil is greater than the potential difference across the primary coil
- Increasing and Decreasing Voltage
- Input and output voltages and turns ratio in a transformer
- Live, neutral and earth wires in a plug 28.5, 28.6 28.6, 28.7
- Potential Difference and Transformer Coils
- Relationship between voltages and turns in a transformer
- Series and parallel circuits
- Step-Down Transformers
- Step-up and step-down transformers in the transmission of electricity
- Step-up and step-down transformers in transmitting electricity
- Step-Up Transformers
- Structure of a transformer
- The basic structure of the transformer
- The National Grid
- The potential difference (p.d.) across the primary and secondary coils of a transformer are related by the equation: p.d. across primary / p.d. across secondary = number of turns on primary / number of turns on secondary
- The uses of step-up and step-down transformers in the National Grid
- This induces an alternating potential difference across the ends of the secondary coil
- Use of units ampere (A), coulomb (C), ohm, volt (V), watt (W),kilowatt-hour (kWh)
- Uses of insulation, earthing, fuses and circuit breakers in domestic appliances 28.6 28.7
- Volt (V), ampere (A), ohm , watt (W), kilowatt-hour (kWh)
- Voltage induced in a conductor on moving through a magnetic field and vice versa
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