1. There are three parts of a transformer
Transformers
There are three parts of a transformer
IRON CORE
PRIMARY COIL
SECONDARY COIL

2. The operation of a transformer
Primary Coil -
Alternating current is input at a given voltage
Iron Core -
Electromagnetic induction occurs producing
alternating current in the secondary coil
Secondary Coil -
Alternating current is output at a
different voltage

3. Example
120 volts is input to the primary coil of the transformer shown. What is the output voltage?
How many loops are in the primary coil? 4
How many loops are in the
secondary coil? 2

4. What is the input voltage?
Solution
What is the input voltage?
120 volts
The relationship between voltage and turns is :
So :
(120) (2) = Vout (4)
What is Vout ?
60 volts !!!!

5. The previous example was called a step-down transformer
WHY???
Because the voltage decreased
What is a step-up transformer?
A transformer that causes the
voltage to increase