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timer Asked: Oct 10th, 2013
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Capacitive Circuits
Explain briefly why a capacitor can block DC voltage.  How might you use this feature in a design? Explain why the impedance Zeq of a parallel RC circuit decreases as the frequency increases.

Discuss why the primary of a power transformer would have excessive current if the secondary were short-circuited.  Why would there be no voltage across the secondary if the primary is open? Explain how a transformer with a 1:1 turns ratio and isolated secondary can be used to reduce the chance of electric shock from a 120-Vac power line.

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