W0= wattmeter reading = 50 W V1= voltmeter reading = 230 V I0= Ammeter reading = 2 A cos‌ϕ0= No load power factor. ∴ Iron loss of the transformer, Pi=W0 W0=V1I0‌cos‌ϕ0 ⇒50=230×2×cos‌ϕ0 ⇒cos‌ϕ0=0.108‌lagging Working component or core loss component, IW=I0‌cos‌ϕ0 IW=2×0.108=0.216A