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Investigating the Voltage - Current characteristics of a Resistor and a Filament Lamp

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Introduction

Investigating the Voltage:Current characteristics of a Resistor and a Filament Lamp

Mr Lawrence’s Prediction

Both a resistor and a filament lamp obey Ohm’s law.

Ohm’s Law

As voltage doubles, so does the current for a conductor at a constant temperature.

Diagram for Experiments

Resistor

image08.png

image00.png

Filament Lamp

image09.png

Results Table’s

Resistor

Power Pack

Reading

Voltage

(V)

Current

(A)

Resistance

2

0.65

0.06

10.83

4

2.36

0.27

8.74

6

3.92

0.45

8.71

8

5.94

0.70

8.49

10

7.58

0.90

8.42

12

9.35

1.09

8.58

...read more.

Middle

2.1

0.41

0.41

0.14

0.41

5

3.08

3.07

3.06

3.1

0.49

0.49

0.49

0.49

6

4.04

4.04

4.04

4.0

0.56

0.56

0.56

0.56

7

4.91

4.93

4.94

4.9

0.61

0.61

0.62

0.61

8

5.98

6.02

6.02

6.0

0.68

0.68

0.68

0.68

9

6.90

6.88

6.93

6.9

0.73

0.73

0.73

0.73

10

7.81

7.82

7.82

7.8

0.78

0.78

0.78

0.78

11

8.69

8.70

8.71

8.7

0.83

0.83

0.83

0.83

12

9.61

9.57

9.61

9.6

0.87

0.87

0.87

0.87

*Rounded to 1d.p

**Rounded to 2d.p

Filament Lamp

Filament Lamp Resistance Table

...read more.

Conclusion

image10.pngimage02.pngimage03.pngimage01.png

image04.pngimage05.png

When the voltage increases and in turn the temperature, the positive ions vibrate (as they have more energy). This means that the electrons find it hard to get through and the resistance increases.

image10.pngimage06.pngimage07.png

This means that Mr Lawrences Prediction is wrong. As Ohm’s law states ‘that as the voltage doubles, so does the current’ and this does not happen in the case of the filament lamp. I can only say the prediction is partly right as the voltage doubles as the current does in the case of the resistor.

...read more.

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