Transformers Flashcards
1
Q
4 components needed
A
alternating current
iron core
primary coil
secondary coil
2
Q
why do you need an alternating current?
A
need a change in magnetic field to induce a potential difference
3
Q
how does a transformer work? 5
A
As current flows through primary coil generates a change in magnetic field magnetic field transmitted along iron core passes through secondary coil inducing a potential difference
4
Q
why doesn’t a direct current work?
A
no induction in secondary coil because you need a changing field which is why you need an alternating current
5
Q
step up transformer
A
more turns in the secondary coil
6
Q
step down transformer
A
more turns in the primary coil
7
Q
potential difference across the secondary coil is greater than the primary coil
A
step up transformer
8
Q
potential difference across the primary coil is greater than the secondary coil
A
step down transformer
9
Q
what does the iron core do and don’t
A
does transfer changing magnetic field
not current/ electricity
