The current which flows through the primary coil of a transformer leads to the production of an induced current in its secondary coil.  This video looks at the physics behind the use of both step-up and step-down transformers in electric circuits.

Please note that this topic will be examined in the higher tier papers only.

Key Words

current, secondary, potential difference, transformer, step-up transformer, step-down transformer, coil, primary coil, secondary coil, iron core, number of turns, power, primary