The secondary toils of many transformers have tapr, these arc tra Connections to

Question

The secondary toils of many transformers have tapr, these arc tra Connections to an intermediate part of the secondary1 coil, so that, in addition to the full secondary voltage, a fixed fraction of the secondary voltage is also available. Consider a transformer with a 115 - V AC primary and a 12 - V AC secondary that has a center tap. The 12 - V AC secondary voltage is applied to a load that dissipates an average power of 4.0 W, and the center tap (6.0 V AC) to a load of average power 12 W. What is the current in the primary?

Explanation / Answer

      Total power delivered tosecondarycoil   PS   =   12+4.0   =   16.0   W    For an idelatransformer   PS   =   Powersupplied to primarycoil   =   16.0   W    VP *IP   =   16.0    Current through primarycoil   IP   =   16.0/115   =   0.139   A

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