Question: the same current. 9) A transformer has an efficiency of 80 % and works at 100 V and 4 kW. If the secondary voltage is

the same current. 9) A transformer has an efficiency of 80 % and works at 100 V and 4 kW. If the secondary voltage is 240 V, Calculate the primary and secondary currents. 10) A coil of wire of 500 turns and mean area 0.25m is rotated with a uniform speed of 300 rpm in a space where there is a mogn

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