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 and mathematics behind the use of transformers in electric circuits and their use in the National Grid.

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

Key Words

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