Transformers
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5 Terms
1
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Why are transformer cores laminated?
To reduce eddy current losses.
2
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What is the turns ratio formula for transformers?
U1/U2 = N1/N2
U1= Primary Input V
U2= Secondary Input V
N1= Number of Primary Windings
N2=Number Secondary Windings
3
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A transformer has 100 primary turns and 10 secondary turns. Is it step-up or step-down?
Step-Down
4
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What is the minimum insulation resistance for a safe transformer?
2 MΩ (tested at 500V)
5
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How does a transformer’s power rating differ from its efficiency?
Power Rating = VA (Vol-Ampere) = Vrms x I rms
Efficiency = Power Out/Power In
Note 
Flashcards (26)