Question

A transformer has 1020 turns in the primary and 12 turns in the secondary.

(a) Is this a step-up or step-down transformer?

(b) If the primary is connected across 120 V rms, what is the open-circuit voltage across the secondary?
( ) V

(c) If the primary current is 0.3 A, what is the secondary current, assuming negligible magnetization current and no power loss?

( ) A

Answer 1

Since the number of turns in the secondary is less than that in primary, it is a step down transformer. Use the equation for secondary voltage in a transformer to find a solution as shown below\

a) since N₂ C Ne it's a step down d transformer N₂ = no. of LN2= " " turns in secondary " " Primary V₂ = V N2 1. s Ug = voltage across primary LV₂ = " " Secondary = (120V) 12 1020 = 1: 41 v power is same in both primary and secondary 1. Pa = P2 1. Vq Iq = V2 Iz >> (1200) 0:34) = (1.414)IZ => Iz = 25.5JA