The maximum efficiency of a transformer occurs when the constant core loss equal the variable copper loss. A 25kva transformer is designed so that the maximum efficiency which is 98%, occurs at 70% of rated load and p.f (a) determine the constant core loss in watts (b) determine the full-load copper loss in watt (c) determine the percent efficiency at full load and 90% pf. (Take note 5 decimal places box the answer) Subject Electrical Apparatus and Divices

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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.