Transformer
Gao Yan
Gabriel Leow Zihui
What is a transformer?
• A transformer is an electrical device that takes
electricity of one voltage and changes it into
another voltage.
How does a transformer work
• First, in an electric circuit, there is magnetism
around it.
• Second, Faraday’s Law, whenever a magnetic
field changes (by moving or by changing
strength) a voltage is made.
Construction
• The construction of a transformer includes a
ferromagnetic core around which multiple
coils, or windings, of wire are wrapped. The
input line connects to the 'primary' coil, while
the output lines connect to 'secondary' coils.
Working principle
• The voltage outgoing is directly related to the
number of turns in secondary coil over
primary coil.
• The voltage at the secondary coils is directly
related to the primary voltage by the turns
ratio, or the number of turns in the primary
coil divided by the number turns in the
secondary coil
Applications
• Electrical Grid
• Firstly, a transformer converts the
voltage from a power plant to
very high usually 155,000 to
765,000 volts so that it can travel
a long distance.
• Secondly, after the current
reached our houses. transformer
is required to transfer the voltage
to 230 volts so that it can power
our home appliances.
Reference
• http://www.energyquest.ca.gov/how_it_work
s/transformer
• http://www.physlink.com/education/askexper
ts/ae427.cfm.html
• http://hyperphysics.phyastr.gsu.edu/hbase/magnetic/transf.html
• http://en.wikipedia.org/wiki/Transformer#Ap
plications