**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

As we know that in transformers we have

here we know that

now from above equation we will have

now we have to reduce this voltage to final voltage of V = 4 V

so again we will have

so we need to take such a winding whose ratio is 1:5

So it is satisfied in X

so answer will be

B)-   X

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