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

Create a circuit that includes a sensor, which in turn will enable me to measure the volume of liquid in a container by reading the voltage from a voltmeter.

Extracts from this document...


Planning Aim: The aim of this investigation is to create a circuit that includes a sensor, which in turn will enable me to measure the volume of liquid in a container by reading the voltage from a voltmeter. Plan: 1. I could use many methods to pick up a change in water level in a container. I could use a rotary potentiometer and attach it to a metal rod, then fix a cork to the metal rod, which will be used as the float that will rise with water level. I will need to use a potential divider in the circuit in order to pick up the changes in resistance, which will cause the voltage to rise or fall. 2. I could also use a length of wire, which, as it becomes immersed in water causes changes in its conductance and therefore changes in its resistance and the voltage across the circuit. I am going to use a rotary potentiometer for my investigation. [No.1] Apparatus: 6v dry cell battery pack Voltmeter Rotary Potentiometer Wires Container for water Cork Copper Rod Fixed Resistor Retort Stand Clamp & Boss Preliminary Tests: I carried out some preliminary tests with my apparatus in order to try and find the best setup for my main experiment. I tested how much water to use - because if I used under 600ml the cork wouldn't float. ...read more.


The potentiometer will be connected to a dry cell battery pack and a fixed resistor, which will be changed to achieve the 4 different resistances I will be using, connected across the fixed resistor will be a voltmeter that will be used to take the results. Circuit Diagram [Fig.3]: [Fig.4] Safety: I will be using an electrical circuit in my investigation, which will be in close contact with water, so I will need to make sure that they do not come into contact with each other, even though the current flowing through the circuit will be very small. I will also be using a 500ml glass measuring jug and therefore will have to be careful not to smash it, and make sure if it does smash that I clear up all the glass fragments straight away. Results Table: No.1: No.2: No.3: Average: Graphs: The graph is plotted using the average of the three sets of results. The results tables showed a few anomalous results, however these seemed to have been ironed out when the average set of results were taken. The graph shows the general trends that were expected. As the resistance was decreased for each test the voltage rose and therefore the height of the graph increased but retained the same pattern of peaks, this shows that the change in voltage is proportional to the resistance of the fixed resistor. ...read more.


metal to attach the crocodile clips to, these also bent very easily and if they touched the voltmeter would obviously read zero. Perhaps the potentiometer had slightly too a high friction to be very reliable when it was being moved by the cork floating on water. Evaluation: I think my results were reliable, however there were a few anomalous results before the average readings were taken. This leads me to believe that the majority of results are reliable. I could improve the experiment by, using a new or larger dry cell batteries so that it removes the possibility that the anomalous results were caused by the batteries running flat. I could also check the results and redo the experiments more than once to achieve a more reliable set of results. Furthermore any of the components may not have been functioning properly. I could also take into account things like rounding up and the accuracy of the voltmeter. If the reading on the voltmeter is changing a lot then it is hard to get a reliable reading and therefore the overall trend of the graphs and the results table could be affected, this could explain the reason why the voltage peaked before the last of the water was added and then fell again at the end. Overall I would say that the results are reliable although perhaps a more sensitive rotary potentiometer would be better. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Systems and Control section.

Found what you're looking for?

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

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 GCSE Systems and Control essays

  1. Investigate the relationship between voltage and Current.

    resistor VbR A V 2 0.9 0.94 4 0.25 2.58 6 0.43 4.30 8 0.60 5.79 10 07.7 7.65 Attempt 2 10.5? resistor VbR A V 2 0.08 0.81 4 0.25 2.54 6 0.42 4.29 8 0.58 5.87 10 0.75 7.66 Attempt 3 10?

  2. Water level sensor

    I find the closest fixed resistor which is 948?. To validate I used voltmeter find the voltage cross fixed resistor and the sensor when the water at max level. 2.25v and 4.27v which is close to the value it should be. at max level the sensor should get two times the voltage than the fixed resistor.

  1. The aim of this investigation is to design, build and test a sensor.

    experiment * Cellotape - to tape down the LDR to the box and mark out distances * Light Dependant Resistor and Resistor - I have used the LDR to detect the levels of illumination in the experiment. I decided on this resistance of LDR and Resistor as they are of

  2. Electronic Combination Lock - create a secure lock to protect a property from intruders.

    specification of the circuit I have found a compatible circuit diagram for the combination lock that I want to build. It includes the over three active components so it suits the brief and its not overly complicated because simplicity is important so I can realistically complete the construction, and fault

  1. Test and evaluate a linear position sensor, and identify a possible use for this ...

    However there is no guarantee, and is probably quite unlikely that each weight was balanced in the exact way as the one before. Also, due to the fact that the mechanical contact is not 100% efficient, that is, there would be some friction involved, this means that with lighter weights/force,

  2. A commercial company requires a dynamic advert for displaying their wares in a showroom/office ...

    Idea 2 How this circuit works! Pulses are supplied from the 555 astable circuit to the 4017. As the pulse from pin 3 constantly changes the 4017 output. The output from the 4017 will rotate around legs 2,4,7,10,1,5,6,9,11. Causing the L.E.D's to appear to be chasing each other.

  1. The aim of my project is to produce a working 'People Counter', which will ...

    Figure 3A working common cathode 7-segment display http://coe.pitt.edu/courses/0501/web-docs/course-notes/fall2002/7Seg_Disp.jpg System Specification Upon completion, the system must be able to detect when a person comes into contact with the input sub-system. To be able to detect a person passing through a turnstile there would have to be a degree of sensitivity to pick up on light blockage from a distance.

  2. An electronics firm wishes to introduce a range burglar alarms. This coursework contains the ...

    Test the double delay unit 20 min. Alpha building and testing manual and multi-meter. 120 min. I tried but I could not understand the instructions. Research into the 4098 chip 120 min. Maplin CD rom 80 min. I think I understand it now Repairing the double delay unit 120 min.

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