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Posted by on Wednesday, August 3, 2011 at 2:56pm.

A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?

  • physics - , Wednesday, August 3, 2011 at 4:50pm

    The primary coil has 360/18 = 20 times the voltage of the secondary coil. It also has 1/20 the current.

    The max current in the secondary circuit is sqrt2*rms current = 1.414*1400/60 = 33.0 A
    In the primary coil, multiply that number by 20.

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