(1) An ideal transformer has 50 turns in its primary coil and 250 turns in its s
ID: 1315499 • Letter: #
Question
(1) An ideal transformer has 50 turns in its primary coil and 250 turns in its secondary coil. 12 V is connected to the primary. a. Find the voltage across the secondary coil. b. Find the current in a 10-ohm device connected to the secondary. c. Find the power supplied to the primary.
(2) Neon signs require about 12000 V for their operation. The primary operates from 120-V lines. a. What is the ratio of the number of loops in the secondary to the number of loops in the primary? b. What is the ratio of the power delivered to the secondary coil to the power supplied by the primary coil?
Explanation / Answer
a)
From Transformer turns ratio
Vs/Vp=Ns/Np
Vs/12 = 250/50
Vs=60 Volts
b)
Current in secondary
Is=Vs/R =60/10 =6 A
c)
Power supplied by primary=Power received by secondary
Pp=Vs Is =60*6=600 Watts
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a)
From transformer turns ratio
Ns/Np=Vs/Vp =12000/120=100
b)
Since
Power delivered to secondary=Power supplied by primary ,so
Ps/Pp=1
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