Chapter 33267Q33.19This person needs to consider the difference between the power delivered by a power plant andIR2losses in transmission lines. At lower voltages, transmission lines must carry higher currents totransmit the same power, as seen in Example 33.8. The high transmitted current at low voltageactually results in more internal energy production than a lower current at high voltage. In hisformula ∆VRaf2, the ∆Vdoes not represent the line voltage but the potential difference between theends of one conductor. This is very small when the current is small.Q33.20The Qfactor determines the selectivity of the radio receiver. For example, a receiver with a very lowQfactor will respond to a wide range of frequencies and might pick up several adjacent radiostations at the same time. To discriminate between 102.5 MHz and 102.7 MHz requires a high-Qcircuit. Typically, lowering the resistance in the circuit is the way to get a higher quality resonance.Q33.21Both coils are wrapped around the same core so that nearly all of the magnetic flux created by the
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .