Revise GCSE Physics


Question:How do transformers work?

The function of a transformer can be explained in 4 steps.

Step 1. When electricity flows through a coil of wire, the coil becomes an electromagnet.

Step 2. Iron conducts magnetism. If an iron core is attached to a magnet, the

Angry face

Angry face

The transformer is based on two principles: first, that an electric current can produce a magnetic field (electromagnetism) and second that a changing magnetic field within a coil of wire induces a voltage across the ends of the coil (electromagnetic induction). Changing the current in the primary coil changes the magnetic flux that is developed. The changing magnetic flux induces a voltage in the secondary coil