Transformers Flashcards
What do transformers do?
Change electrical energy from one p.d. to another
Where are they used and why?
National Grid
To make transmission of electricity efficient
What do transformers consist of?
A primary coil, a secondary coil and a soft iron core
When there is an alternating p.d. across the primary coil…
an a.c. flows
The a.c. creates an…
alternating magnetic field in the iron core
This alternating magnetic field induces…
an alternating p.d. across the secondary coil
What is the equation for transformers?
p.d. across primary no. of turns primary
_______________ = _________________
pd across secondary no. of turns secondary
In a step up transformer, on what coil are there more turns?
Secondary
In a step down transformer, on what coil are there more turns?
Primary
Why is an iron core used?
It can be easily magnetised
What voltage is used in households?
230V
