5- Find the efficiency of a 150KVA transformer at 25%, 33% and 100% full load at: a/ unity power factor b/ 0.8 lagging P.F. if the copper loss is 1600W at full load and the iron loss is 1400W. ignore the effect of temperature rise and magnetizing current. [a/ 96.150, 96.940, 98.04%; b/ 95.230, 96.210, 97.560%]

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Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.