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Unformatted text preview: 9. a) How to calculate and draw impedance, voltage, and power triangles. b) For a load with impedance Z L = R + jX, the power factor, pf = cos = 2 2 X R R + . 10. a) For a transformer with turn ratio N = 1/n, V 2 = N V 1 , and I 2 = I 1 /N. Also, the source effectively sees the load reduced by a factor of N 2 , or Z/N 2 . b) The power transmission efficiency is given by = P load /P source . c) Maximum power transfer occurs when the equivalent Z load = (Z source ) * . 11. How to write differential equations relating electrical and mechanical subsystems in an electromagnetic transducer....
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 Spring '09
 SHOANE

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