Topic 13: Electromagnetic induction – GCSE Edexcel Higher Combined Science Physics revision notes

Electromagnetic induction, transformers and the National Grid. 5 lessons in 2 subtopics.

The National Grid is a system of cables and transformers linking power stations to consumers across the country. The National Grid Introduction notes cover this in full.

A transformer is a device that uses electromagnetic induction to change the voltage of an alternating current supply. The How transformers change alternating voltage notes cover this in full.

The generator effect is when a potential difference is induced across a conductor that moves relative to a magnetic field, or when the magnetic field around it changes. The Induced potential difference and opposing change notes cover this in full.

Alternating current in the primary coil creates a changing magnetic field in the iron core. The How transformers change alternating voltage notes cover this in full.

Wind turbines use the generator effect: the wind turns the blades, which rotate a generator inside the nacelle. The Induced potential difference and opposing change notes cover this in full.

Magnetic flux is a measure of how much magnetic field passes through an area. The Induced potential difference and opposing change notes cover this in full.

A power station is a facility that generates electrical energy from various sources like fossil fuels, nuclear power, or renewable sources such as wind and solar. The National Grid Introduction notes cover this in full.

In a transformer, AC in the primary coil creates a changing magnetic field in the iron core; this field links with the secondary coil and induces a voltage there. The How transformers change alternating voltage notes cover this in full.