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A transformer is designed to convert a voltage from 240 V a.c. 12 V a.c., and ha...
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A transformer is designed to convert a voltage from 240 V a.c. 12 V a.c., and has 4000 turns on its primary coil. If it is 100% efficient, and the current in the secondary coil was 0.4 A, then the current in the primary coil should be
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