Tramsformers Flashcards
What do transformers do
Change the Pd but only for alternating currents
What do all transformers have
Two coils of wire the primary and secondary joined with an iron core
What is applied across the primary coil
Alternating pd
What happens when the alternating current is applied cross the primary coil
The iron core magnetises and demagnetises quickly
What does does changing the magnetic field induce
An alternating current in the secondary coil
What happens if the second coil is part of a complete circuit
Causes a current to be induced
What is the ratio between the primary and secondary potential difference the same as
The ratio between the number of turns in the primary and secondary coils
What do step up transformers have
More turns in the secondary coil
What do stem down transformers have
More turns on the primary coik
