• 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. Building a mass balance to measure small weights (0g-100g) using a rotary potentiometer

    At about 20cm - 30cm away from the middle of the uniform meter rule I attached a spring to a string hanging from the meter rule. At the other end of the meter rule, I hung masses. HOW THE CIRCUIT WORKS: The 1k variable resistor is adjusted till the voltmeter reads 0.

  1. The paper discusses the issues associated with the risks assessed between the organizations bidding ...

    The Coca Cola Corporation addressed these concerns by stated that due to net loss of Coke, changes were needed. Aware of the employees' concerns; top management executives added that changes in management will create good consequences for employee well-being, motivation, and productivity.

  2. Water level sensor

    Because this is a potential divider (voltage share = resistance share) there is more resistance on the sensor so more energy is needed to pass the resistor therefore more voltage they get. For reading, I need to remember when I read the level of water or any liquids, I need

  1. My aim is to produce a line follower robot with a bump sensor which ...

    I had to carry out all safety procedures to ensure that there was no risk of any damage. When testing my components I made sure that I used a resistor as well, this was so that there was not too much voltage passing through which could have blown up the component.

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

    A voltage increase is seen across the LDR when bulbs of increasing Wattage are placed next to it. Plan The qualities which I have decided to investigate are Resolution, Response Time, Sensitivity and I have also looked at Random Variation because of the equipment I have used (Digital Multimeter)

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

    When you release it, it disconnects the circuit, and the bell stops ringing. A major part of my project is that I need to make sure that all the switches cannot be pressed at once to activate the unlocking sequence.

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

    This process was repeated a few times to minimize error. Each time weights were applied to the sensor's mechanical contact, I made sure not to force them down, but allowed them to rest freely on the contact, with the string drawn tight enough to hold the weights more or less straight upright, without restricting them in any way.

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