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A transformer with 1000 turns on the primary coil is used to decrease the voltage from 2500 V to 120 V for home use. How many turns should be in the secondary coil? A) 84 turns B) 48 turns C) 6.4 turns D) 5 turns E) 250 turns

Respuesta :

Answer:

The number of turns in the secondary coil is 48.

(B) is correct option.

Explanation:

Given that,

Number of turns on primary coil= 1000

Primary voltage = 2500 V

Secondary voltage = 120 v

We need to calculate the turns  in the secondary coil

Using relation between voltage and number of turns in primary and secondary coil

[tex]\dfrac{V_{s}}{V_{p}}=\dfrac{N_{s}}{N_{p}}[/tex]

Put the value into the formula

[tex]\dfrac{120}{2500}=\dfrac{N_{s}}{1000}[/tex]

[tex]N_{s}=\dfrac{120}{2500}\times1000[/tex]

[tex]N_{s}=48\ turns[/tex]

Hence, The number of turns in the secondary coil is 48.