A transformer uses 91 V supply to operate 13 V device, then the current in the primary coil is 0.27A.
What is transformer?
A transformer is an electrical device which is involved in transferring electric energy from one AC circuit to another, either stepping up or down.
As, from the ohm's law, voltage is directly proportional to the current flowing through the coil.
I₂ / I₁ = V₂ / V₁
The current from the transformer I₁ is 1.9A, the voltage supply V₁ = 91V and the voltage to operate is 13 V, then the current through the primary coil is
I₂ = (91 / 13 ) x 1.9
I₂ = 0.27A
Thus, the current from the primary coil is 0.27A.
Learn more about transformer.
https://brainly.com/question/15200241
#SPJ1
