Electrical Resonance: Q-Factor, Active Resistance & Graphs

In summary, the conversation discussed a circuit with a generator, resistors, an active resistor, and inductance and capacitance values. The assignment was to measure voltage and create graphs, but the focus was on understanding why the calculated active resistance was significantly lower than the actual active resistor. The individual sought advice on how to explain this discrepancy.
  • #1
shakaflaka
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Homework Statement


The scheme is here: http://img196.imageshack.us/img196/9366/lcre.jpg
G generates soundwaves, Re are all 10 ohm resistors , R is an 98000 active resistor, L=100mH, C=0.253 μF
The assignment was to measure the voltage through different parts of the circuit near resonance frequency and draw some graphs, but that's not the issue here.
When calculating the active resistance from the formula
R=Q/sqrt(C/L),
where Q is the Q-factor, the result is ~8900 ohms. This answer is correct and supposed to be so, but I have to explain WHY is this 11 times less than in the active resistor and this is the problem here. Can anyone give me some good advice?
 
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  • #2
bump.. anyone?
 

Related to Electrical Resonance: Q-Factor, Active Resistance & Graphs

1. What is electrical resonance?

Electrical resonance is a phenomenon that occurs when an electrical circuit is able to absorb and store energy at a particular frequency. This frequency is known as the resonant frequency and is determined by the circuit's inductance and capacitance.

2. What is the Q-factor in electrical resonance?

The Q-factor, also known as the quality factor, is a measure of the efficiency of an electrical circuit in storing and releasing energy. It is calculated by dividing the maximum energy stored in the circuit by the energy lost per cycle.

3. How does active resistance affect electrical resonance?

Active resistance, also known as ohmic resistance, is a type of resistance that dissipates energy in the form of heat. In electrical resonance, active resistance can decrease the Q-factor and cause the resonant frequency to shift.

4. What types of graphs are commonly used to represent electrical resonance?

The most commonly used graphs to represent electrical resonance are the frequency response curve, which shows the relationship between frequency and amplitude, and the impedance curve, which shows the relationship between frequency and impedance.

5. How is electrical resonance used in practical applications?

Electrical resonance is used in many practical applications, including in radio and television broadcasting, wireless communication systems, and electrical filters. It is also used in resonance imaging (MRI) machines in the medical field.

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