What is the primary:secondary turns ratio of this transformer ?

A step down transformer reduces a 130 V AC supply to 7 V AC in order to power a centrifuge motor with a power rating of 21 W.

What is the primary:secondary turns ratio of this transformer to the nearest whole number?

1 Answer
May 2, 2018

#19:1#

Explanation:

For a transfomer, the relationship between coil turns and voltage is:

#V_p/V_s=N_p/N_s#

  • #V_p,V_s# are the primary and secondary voltages

  • #N_p,N_s# are the primary and secondary number of coil turns

Here, we see that:

#V_p/V_s=130/7#

#:.N_p/N_s=130/7#

#=18.5714286:1#

#~~19:1# to the nearest whole number