Determine the output voltage and curent of the transformer. Assume they are 100 efficient.

120 V
15 A

primary coil 60 turns

Secondary coil 20 turns

Question

Determine the output voltage and curent of the transformer. Assume they are 100 efficient.

120 V
15 A

primary coil 60 turns

Secondary coil 20 turns

anonymous · Answer

The output voltage goes as the ratio of the turns.  So, the secondary has one third as many turns, so the voltage is one third as much.  Additionally, the power radiated away by the primary is the same as the power in the secondary.  Since
$$P = IV $$
and V is decreased by a factor of three, I is increased by a factor of three.

anonymous · Answer

So, out put voltage is 1/3
then...output Voltage for 2nd is 40 V 
if power is the same, P=(120)(15)
P=1800

1800=(I)(40
I=1800/40
I= 45 ???
right?

anonymous · Answer

Looks good to me

anonymous · Answer

Tnx Jem :) You probably helped me to pass my exam, whch is tomorrow

Tnx!

muhammad_nauman_umair · Answer

As,Input voltage I1=15
Input voltage V1=120
N1=60
N2=20

N1/N2=V1/V2
so
V2=40

ANd

I1/I2=V2/V1

So I2=45amperes