An ideal transformer has Nₚ/Nₛ=5. A secondary load is 12+j16 Ω and the primary voltage is 250 V RMS. Determine the primary-current magnitude and source power factor.
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An ideal transformer has Nₚ/Nₛ=5. A secondary load is 12+j16 Ω and the primary voltage is 250 V RMS. Determine the primary-current magnitude and source power factor.

G1 Physics · Accepted Answer

Vₛ=50 V. |Z|=20 Ω, so Iₛ=2.5 A and power factor=12/20=0.6 lagging. Iₚ=Iₛ(Nₛ/Nₚ)=2.5/5=0.5 A.