TRANSFORMER THEORY
Transformers
Example 2:
An iron core transformer with a primary voltage of 240 volts has 250 turns in the
primary and 50 turns in the secondary. Find the secondary voltage.
Solution:
VP
VS
NP
NS
Next, solve for VS.
VS
NS
NP
VP
VS
50
250
240 volts
VS
48 volts
Example 3:
A power transformer has a turns ratio of 1:4. If the secondary coil has 5000 turns
and secondary voltage is 60 volts, find the voltage ratio, VP, and NP.
Solution:
VR
TR
VR
1:4
VP
VS
VR
1:4
1
4
VP
1
4
VS
60
4
15 volts
TR
NP
NS
1
4
NP
1
4
NS
5000
4
1250 turns
ES-13
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