• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15
  16. 16
    16
  17. 17
    17
  18. 18
    18
  19. 19
    19
  20. 20
    20

Physical - Circuit

Extracts from this document...

Introduction

Science Investigation Report        Daniel

                F5D

P                O                A                E                

6                6                6                4                24/30

image00.png

Name: Daniel Shih

Class: F5D

Teacher: Dr. Aravind

School: Kiangsu-Chekiang College International Section

Date: 30th November, 2006image01.png

Index

image02.png

Introduction

Planning – Aims, Variables, Fair Test, Prediction, Hypothesis

Planning – Apparatus, Procedure

Planning –Procedure of temperature, measurement, safe rules

Obtaining

Analyse – Table 1

Analyse – Table 2

Analyse – Table 3

Analyse – Table 4

Analyse – Table 5

Analyse – Table 6

Analyse – Table 7

Analyse – Table 8

Analyse – Compare and Contrast

Evaluation, Conclusion, Bibliography

image03.png

Introduction:

What is an electrical circuit?

An electrical network is an interconnection of electrical elements such as the resistors, inductors and switches. We use circuit to measure the voltage, and also the current of some conductors which can transfer the electricity. To design an electrical circuit, first we need to be able to predict the current and the voltage.

What is electrical resistance?

Electrical resistance is a measure of the voltage divided by the current flows in the electrical circuit. The unit of resistance Is Ohms,Ω. The quantity of resistance in an electric circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit. The way of measuring the resistance in a circuit is:

image05.png

“R” is the resistance of the object, measured in ohms.

“V” is the potential difference or the voltage across the object, measured in volts.

“I” is the current passing through the object, measured in amps

So what are the uses of electrical circuit?

        This is a test to find out the best conductor in metals, the higher the resistance, that means the better the metal could be used to pass the electrons through.

Also, the temperature of the metal will affect the amount of electrons flows at each time, by heating the metal up, it would expand and allows more resistance; so the temperature were low, it might can’t conduct electricity at all.

Planning:

Aims:

...read more.

Middle

20

0.3

3.4

0.3

3.5

0.3

3.45

25

0.35

3.4

0.35

3.4

0.4

3.4

30

0.4

3.2

0.4

3.1

0.4

3.1

Length (centimetres)

Voltage (Volts)

Current (amps)

Resistance (Ω)

5

0.1

3.5

0.0286

10

0.2

3.75

0.0533

15

0.25

3.62

0.0691

20

0.3

3.45

0.0890

25

0.37

3.4

0.1088

30

0.4

0.3.13

0.1278

image09.png

In this graph, we could see that the resistance of the wire were increasing as the length increases. This means constantan wire with diameter of 1.25mm can be use as a good conductor. It nearly occurred in a straight line if the resistance of length 5cm were higher a little bit.

Table 3: This table tells about the normal wires used in the experiment, Constantan wire with diameter of 0.90mm.

First Tried

Second Tried

Third Tried

Length (centimetres)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

5

0.2

3.5

0.1

2

0.1

2.1

10

0.2

1.8

0.1

1.8

0.1

1.8

15

0.2

1.8

0.1

1.75

0.2

1.75

20

0.25

1.7

0.25

1.8

0.2

1.7

25

0.3

1.7

0.3

1.7

0.3

1.7

30

0.4

1.7

0.35

1.7

0.35

1.7

Length (centimetres)

Voltage (Volts)

Current (amps)

Resistance (Ω)

5

0.13

2.5

0.052

10

0.13

1.8

0.0722

15

0.17

1.77

0.0960

20

0.18

1.73

0.1040

25

0.3

1.7

0.1765

30

0.37

1.7

0.2176

image10.png

In this table, I can see that the resistance weren’t stable. With the length of 20cm, this might because of the ammeter have some problem while we’re measuring. I believe if we have a chance to retry it over again, we should get better results as what we have expected.

Table 4: This table shows about the normal wires used in the experiment, Constantan wire with diameter of 0.90mm, however is longer than the one before. Error*

First Tried

Second Tried

Third Tried

Length (centimetres)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

35

0.7

2.6

0.7

2.7

0.7

2.8

40

0.5

2.5

0.7

2.6

0.7

2.6

45

0.5

2.5

0.4

2.6

0.4

2.5

50

0.8

2.2

0.8

2.3

0.8

2.3

55

0.9

2.3

0.9

2.3

0.9

2.4

60

1

2.3

0.9

2.4

1

2.4

Length (centimetres)

Voltage (Volts)

Current (amps)

Resistance (Ω)

5

0.7

2.7

0.26

10

0.64

2.54

0.26

15

0.44

2.54

0.18

20

0.8

2.27

0.36

25

0.9

2.34

0.39

30

1

2.37

0.43

image11.png

As the table shows above, the resistance of the length 5cm and 10cm were equal, and then it suddenly decreases. This shows there’s an error; I think it happened because we didn’t set our circuit in the correct positon.

Table 5: This table shows the details about normal wires used in the experiment, Constantan wire with diameter of 0.90mm, however is longer than the one before, retry.

First Tried

Second Tried

Third Tried

Length (centimetres)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

Voltage (Volts)

Current (amps)

35

0.4

1.6

0.4

1.6

0.45

1.6

40

0.45

1.6

0.45

1.6

0.5

1.6

45

0.5

1.5

0.5

1.6

0.5

1.55

50

0.55

1.5

0.55

1.5

0.55

1.5

55

0.6

1.5

0.6

1.5

0.6

1.5

60

0.6

1.45

0.6

1.5

0.6

1.45

Length (centimetres)

...read more.

Conclusion

Conclusion

In my own opinion, I believe this is quiet a nice experiment, and I also get some good results as well. I’ve found out that my prediction was correct, about the copper wire with a diameter of 90mm will transfer the least energy compare to the rest of the two.

        I also learned about the circuit of electricity, I could now tell how the current flowing was, and how it could be measured. By looking at the results I’ve got, I was really please, even though some mistakes happened in the experiment, but we still success to finish our experiment in the time limit, which is such a great thing to celebrate.

        Resistor can be use to protect the ammeter, this is a very useful apparatus; I know the ammeter was an important character in the circuit while measuring the resistance. So if the ammeter were damage cause of the flowing current were too high, this will be a very bad news for us. So take care of the equipment is another important thing I learn from this experiment.

        If I have a chance to repeat the experiment, I would be likely to set my circuit up just like this time, because there shall be less problems. And I might use the copper wire more often in the circuit, using copper wires it allows more current to pass through compare to the Nicrhome and Constantan wires, which might help in my future life.

Bibliography:

http://en.wikipedia.org/wiki/Series_and_parallel_circuits

http://www.circuitcity.com/ccd/home.do

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 Electricity and Magnetism essays

  1. Marked by a teacher

    Investigate young's modulus behind Constantan and Copper.

    4 star(s)

    The property of the other elements is what makes an alloy stronger then a pure metal. Necking does not occur in metals, it is quite hard for it to occur, this is because there is no dislocation of atoms, which occur within the structure to make this, stronger, and hold its atoms together.

  2. Marked by a teacher

    Draw stress and strain graphs for the metal copper and the alloy constantan. Calculate ...

    4 star(s)

    Stress is calculated by force/area. "The stress is force per unit area" (Quoted from Advancing physics textbook). The yield stress is the amount of stress it takes for a material to yield, this is when a metal gives before it snaps/breaks, at this point and beyond it is permanently deformed

  1. Peer reviewed

    Investigation in resistance in wires

    5 star(s)

    attention because my group and I were discussing the previous results, also we didn't have enough time to get a more accurate measuring method than a 1m ruler which wasn't very accurate. Despite the anomalies the trend of the results showed that the experiment obeyed ohms law.

  2. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    the same length the nichrome wire would have a resistance of 4.6 ohms and my Manganin wire will have a resistance of 2 ohms and constantan will be at 4.5 ohms. I from this I can predict the placement of the result on my graphs with the metal with the

  1. Resistance and Wires

    represents the value of the highest recording taken from the experiment, and the lower line represents the lowest value. The cross in between the two lines represents the mean result. This is the most accurate result, calculated by dividing the sum of each recording by the number of recordings.

  2. relationship between voltage and current

    Since the temperature coefficient of resistivity for pure tungsten is relatively constant over the range of lamp temperatures, it provides a convenient means for measuring the average temperature of a filament. Reference: http://www.sylvaniaautocatalog.com/ The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma (), is a physical constant involving black body radiation.

  1. Determining Voltage, Resistance and Current in a Parallel, Series and Series-Parallel Circuit.

    (Note: make sure the multimeter is set to 200mA) Macintosh HD:Users:TrixSwift:Desktop:Screen Shot 2013-10-20 at 6.22.52 PM.png Parallel Circuit 1. Connect the bulbs together with the wire as shown in the diagram below Macintosh HD:Users:TrixSwift:Desktop:Screen Shot 2013-10-20 at 6.24.56 PM.png 1. Using the multimeter measure the resistance of each bulb. 2.

  2. Aim: I am going to carry out an investigation to find how the resistance ...

    For a circuit to work there must be no breaks, if there is a break then everything stops. An electric charge must also go all the way round the circuit. When a wire heats up they will act differently and a blockage will be made.

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