Electromagnetic Induction

• 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 voltage.
• Secondary voltage/primary voltage = Secondary turns/primary turns.