Electricity and magnetism
- This is the idea that magnetism can travel from one object to another even though they are insulated.
- An example of how magnetic induction is used is in transformers.
- Two coils of wire are wrapped around an iron core.
- The primary coils are connected to the power supply.
- The secondary coils are connected to the device.
- An electromagnetic field is created from the primary coils.
- This induces a magnetic field in the core.
- This in turn induces a current in the secondary coil.
- The number of coils is proportion to the amount of voltage so a transformer is used to increase or decrease the
- Secondary voltage/primary voltage = Secondary turns/primary turns.