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

Effect of changing the temperature on the resistance of a thermistor

Extracts from this document...

Introduction

Name: Ray Li

Physics Coursework

Aim: Effect of changing the temperature on the resistance of a thermistor

I am going to find out has the temperature effects the thermistor’ resistance in the circuit.

Planning

Method:

  1. Clear the table and take off the needless thing
  2. Use the wires to link all the equipment to complete the circuits.
  3. Put about 25cm3 water in the beaker.  
  4. Turn on the gas to boiling the water.
  5. Look at the thermometer and  record the p.d and current each 5 C
  6. Repeat this experiment.
  7. Put all data into table.
  8. Calculation the resistance and draw the graphs.

The equation is: Resistance(R) = Potential different (p.d.)

                        Current (I)        

Appliance list:

Wires- Use these wires to link all appliances to complete the circuit.

Power Supply- Use these supply the energy into circuit.

Thermistor- I use this to change the resistance in the circuit.

Voltmeter- Measuring the volt in the circuit across the thermistor.

Ammeter- Measuring the current in the circuit through the thermistor.

Beaker- Have thermistor and water made above at same temperature.

Bunsen burner- I am boil the water and increasing the temperature of thermistor.

Thermometer- Measuring the temperature of the thermistor.

...read more.

Middle

45℃

0.0017

1.2

45℃

0.002

1.6

50℃

0.0018

50℃

0.0022

1.2

55℃

0.0021

1.2

55℃

0.0024

1.2

60℃

0.0022

1

60℃

0.00245

1.1

65℃

0.0023

1

65℃

0.0026

1

70℃

0.0025

0.95

70℃

0.0028

1

75℃

0.0025

0.9

75℃

0.003

0.9

80℃

0.0028

0.8

80℃

0.00325

0.9

85℃

0.003

0.8

85℃

0.0033

0.8

90℃

0.00315

0.75

90℃

0.0035

0.8

95℃

0.0033

0.75

95℃

0.0037

0.8

100℃

0.0034

0.75

100℃

0.0039

0.75

There have list of equation:

I will use this equation find out the resistance

Resistance(R) = Potential different (p.d.)

                    Current (I)

I use equation find out the average of resistance:

(Resistance1 + Resistance 2)÷2=Average of resistance.

...read more.

Conclusion

Slope A:

 (1000-570) / (55-35) = 21.5

The gradient is 21.5

Slope B:

(285.7-220.6) / (100 -80) = 4

The gradient is 4

In the second experiment graph:

Slope A:

(997 – 500) / (55 – 35) = 23.5

The gradient is 23.5

Slope B:

(242.4-192.3)/ (55-35) = 4.23

The gradient is 4.23

In the average of resistance

Slope A:

(970.55-535)/ (55-35) = 21.78

The gradient is 21.78

Slope B:

(280-206.45)/ (55-35) =3.68

The gradient is 3.68

The average gradient

Slope A gradient

21.78

Slope B gradient

3.68

In the graph if the gradient is large, there have large current flow in and the low volt, the resistance will high decrease. Also the gradient is small, the resistance will decrease is low.

All the graphs in 35℃ to 55℃ decrease very faster, but the end 80℃to 100℃ is decrease quite slow. This is same with my prediction graph.

Evaluation

In my experiment I should repeat few more times to have more data. This could make the result fair.

In my graphs have some points did not on the best-fit line. I could have some errors in my experiment. It could be read the voltmeter or ammeter not ready correct have some error. I should read quickly. And than the thermometer is not ready measuring the thermistor. Because the thermometer did not close the thermistor. So there have a little error to change the result. So I should use the stand to keep thermometer close the thermistor.

...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

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. Investigate how the temperature affects the resistance of a thermistor.

    All equipment must be kept the same in my experiment. The thermistor must be the same one throughout because different sizes of thermistors react differently to heat and they can be made in different ways to react more or less with heat than others.

  2. Investigate the relationship between temperature and resistance in a thermistor.

    0.23 11.46 11.42 11.52 49.83 49.65 50.09 49.86 100 0.25 0.24 0.25 11.42 11.42 11.50 45.68 47.58 46.00 46.42 Analysis From my graph I can clearly see that as the temperature increases the resistance decreases. This is because as the thermistor increases in temperature the lattice atoms move faster and

  1. Investigating the effect of 'length' on the resistance of a wire

    31.88 80.0 2.59 0.06 43.17 90.0 2.60 0.06 43.33 The second set of results is shown in the table below: TABLE No2 Length of Wire (cm) Voltage (V) Current (A) Resistance (?) - rounded up to 2 d.p R=V/I 10.0 1.70 0.35 4.86 20.0 2.00 0.22 9.09 30.0 2.25 0.17

  2. Investigation into how the resistance of a thermistor varies with temperature.

    * V2 = the voltage reading with two batteries. * V3 = the voltage reading with three batteries. * I 1 = the amp reading with one battery. * I 2 = the amp reading with two batteries. * I 3 = the amp reading with three batteries.

  1. physics sensor coursework

    In the averaged graph shown above, there is only one anomaly, which is the value at 200 lux. This can be caused by a variety of factors. These may involve a change in the external environment, such as the humidity in the surroundings or the temperature.

  2. For my sensor project coursework I will be investigating a thermistor.

    a component can be 'tapped off', thus giving a divided proportion of the total potential difference. The circuit used is shown below. Another way this circuit can be used is to sense a change in the surrounding environment. This can mean substituting one of the fixed resistors for a form of variable resistor.

  1. Effect of Temperature on resistance

    More obviously, I made sure that the two wires going into the thermistor did not cross, as that would short-circuit the circuit. I put the thermometer at the same level as the thermistor in the beaker, so they would be the same temperature.

  2. Find The Internal Resistance Of A Power Supply

    Figure 3 below illustrates how I did this: Prediction: I predict that as the internal resistance of the power supply will increase as the voltage setting is increased and there will be a greater voltage drop across the power supply as the voltage setting in increased.

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