Part of The Student Room Group

  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Electrical Resonance - Research and rationale.

Extracts from this document...

Introduction

Azeem Mir

Electrical Resonance

Research and rationale

I have chosen to investigate the resonance in circuits after studying digging up the past and technology in space modules. Also my knowledge in electronics has been useful as it allowed me to understand the behavior of the apparatus, such as an oscilloscope, and the principles used in the investigation. I have used the physics principles for capacitance and inductance where the combined impedances cancel each other out or reinforce each other to produce a minimum or maximum impedance. Impedance is the alternating-current equivalent of resistance.

For my research I am going to look on the internet for any relevant information about resonance and the type of circuits it appears in. Also I will look back at the A-level physics textbook which contains the “Digging up the past” and “Technology in space” modules to refresh what I already learnt about resistance.

For each circuit, resonance occurs at a given frequency called the resonant frequency, which depends on the amounts of inductance and capacitance in the circuit. If an alternating voltage of the resonant frequency is applied to a circuit in which the capacitance

...read more.

Middle

All the signal voltages in the experiment will be small and harmless. The mains voltage in the mains powered equipment is dangerous but is screened in normal use. Also no food or drink will be brought into or consumed in the lab and the work area will be clear of all but essential apparatus and equipment.

Method

  1. Firstly I will be collecting and setting up the apparatus shown in the diagram above.
  2. I will then ensure the inductor is set on 10mH, ensure the capacitor has a value of 7000pF and set the decade resistance box to 20Ω.
  3. then I will connect one input of the oscilloscope between A earth to measure Va and the other input between B and earth to measure Vb.
  4.  I will then adjust the oscilloscope to display stable traces of Vb and Va simultaneously.
  5. Once this has all been completed I will look for the resonant frequency by slowly adjusting the frequency of the signal generator until the maximum of Vb meets Va sharply (in-phase).
  6. I will then repeat the experiment for different combinations of inductors and capacitors and record my findings.

Accuracy and sensitivity

For my results I will aim to record values up to 3 decimal points and keep this consistent throughout my results.

...read more.

Conclusion

c14" colspan="1" rowspan="1">

0.020

50.00

40Ω

0.018

55.56

50Ω

0.015

66.67

60Ω

0.013

76.92

70Ω

0.012

83.33

80Ω

0.011

90.91

90Ω

0.010

100.00

100Ω

0.009

111.11

Log frequency

Log L*C

1

1.25

4.93

2

1.54

4.31

3

1.36

4.69

4

1.04

5.34

5

1.71

3.96

6

1.53

4.34

7

1.42

4.58

8

1.2

4.99

Conclusion

From my experiment I have successfully shown that resonance occurs in a RLC circuit. I have also shown the formula regarding resonance: image03.png

is true by calculating the slope on my graph of

log LC against log frequency which was -0.48 verifying the square root in the formula.

Limitations

The limitations to my results are that there wasn’t a very large frequency range on the signal generator which would allowed me to utilize an even lager combination of inductors and capacitors which would have produced me more detailed graphs. Also I didn’t have the time or equipment to observe resonance in other types of circuits like the types found in radios and televisions which would have given me the chance to see whether the formula applied to these circuits.

Modifications

I could have modified the experiment by utilizing a signal generator with a larger frequency range allowing me to use combinations of inductors and capacitors where the resonant frequency is either extremely high or low.

Further experiments

I could further the experiment by observing the way resonance works in radios and televisions and how the circuits achieve it. This would provide me with a deeper understanding and larger knowledge of electronic resonance and its applications.

Bibliography

[1] “Resonance (electronics)” - Microsoft Encarta encyclopedia.

[2] The physics of resonance -  www.intuitor.com/resonance

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

or


Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. Investigating the Capacitance of a Parallel-Plate.

    The x-coordinate of the centroid of the three points = Percentage error = The y-coordinate of the centroid of the three points = Percentage error = The slope of the best fit = Possible percentage error = 2.19% + 1.69% = 3.88% Possible absolute error = The slope of the

  2. Single Phase Transformer (Experiment) Report.

    Discussion with ECP and experiment. Equivalent Circuits are used throughout transformer businesses to predict the voltage regulation and efficiency incase of problems in circuit, consistency in a circuit or maybe boosts at predicted times like in T.V viewing when there is something very popular being viewed, a lot more people watch T.V and watch a specific channel.

  1. Objective: l To rectify ...

    This occurs until the voltage across the capacitor equals the peak voltage of the supply. After the point of peak voltage, the applied voltage decrease. The potential of the plate of the capacitor is greater than the potential of the supply.

  2. A. Study of phase difference between voltage and current in series RC ...

    the capacitor beause the current across the resistor is in phase with that of voltage. By measuring the voltage across the resistor, the current across the capacitor can be determined. 3. The phase differences between the voltage and the current for both RC and LR circuits in steps 5 and 11 were not equal to 90�.

  1. AC Generator

    Record the current reading. 12. Now for the other variable, turn the hand drill to a faster velocity and record the current reading. Then turn the hand drill to a slower velocity from the original velocity and record the current reading.

  2. To find which of the circuits, shown below, are most suitable to measure a ...

    Fair Test By not moving the components and wires I will endeavour to keep the resistance constant, by not restricting the flow of current (and thus altering the resistance). I will use the same resistor for each circuit because I don't know how accurate the labels on the resistors are,

  1. Investigating the capacitance of a parallel report

    The frequency and voltage of the signal generator was adjusted such that a sound was heard and the spot on the light beam galvanometer was deflected. Investigation 1 : Charge and Applied Potential Difference We separate the capacitor plates with 4 polythene spacers, one at each corner.

  2. Is polymer electronics the future of TV screens

    They are also easy to manipulate, so the electronic properties that are needed for a certain job, for example conductivity can be easily obtained, this process is known as doping, which is a process by which electrons are either added or taken away Properties of Polymers Plastic materials are organic

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work