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April 19, 2014

Homework Help: Physics

Posted by Busker on Monday, October 22, 2012 at 11:37pm.

Suppose there are two transformers between your house and the high-voltage transmission line that distributes the power. In addition, assume your house is the only one using electric power. At a substation the primary of a step-down transformer (turns ratio = 1:25) receives the voltage from the high-voltage transmission line. Because of your usage, a current of 67.5 mA exists in the primary of the transformer. The secondary is connected to the primary of another step-down transformer (turns ratio = 1:39) somewhere near your house, perhaps up on a telephone pole. The secondary of this transformer delivers a 240-V emf to your house. How much power is your house using? Remember that the current and voltage given in this problem are rms values.

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