Electromagnetic Induction
Physics: Edexcel IGCSE, topic 6.3.1
Electromagnetic Induction
A current is a flow of charge. A potential difference (p.d) is needed for a current to flow and the p.d drives a current round a circuit. A p.d can be induced in two ways:
Electrical conductor moving in magnetic field
- If a wire (or any electrical conductor) moves near a magnet, it induces a p.d in the conductor.
Changing magnetic field through electrical conductor
- A changing magnetic field is a magnetic field with changing strength.
- If there is magnetic field through the middle of a coil of wire, it is ‘linked’ with the coil.
- A changing magnetic field that is linked with a coil of wire induces a p.d in that wire.
Test yourself on Electromagnetic Induction
What is a current?