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

Extracts from this document...

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.

Filament Lamp

## Resistor

(V)

(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

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

Conclusion

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.

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.

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