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Black Box Electronics Coursework

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Introduction

Investigating in Sc. 4(Physics)

Problem:

 Three different types of electrical components are hidden in “Black Boxes”, my task is to identify each component by investigating its properties.

The components are labeled A, B, C, and consist of a fixed resistor, a light emitting diode and a filament bulb.

Which is which?

Planing

In each graph the current is reversed in the negative part of it.image08.png

Ohmic Conductor:

If a substance gives you a straight graph, like this one, this then will be an ohmic conductor.

Ohm’s Law:

George Ohm discovered that the current flowing through a metal wire will be doubled (that doesn’t apply on a lamp because it changes the temperature)

image09.png

Diode:

...read more.

Middle

From the other side of the component attach the switch.Attach the switch to the variable resistor.Finally attach the variable resistor to the negative (…..).

image10.png

image05.png

Results:

Component A

Tries

Current

Voltage

Resistance

1

0.1

1.2

12

2

0.05

0.61

12.2

3

0.02

0.27

13.5

4

0.01

0.19

19

5

0.01

0.14

14

-6

-0.01

-0.14

14

-5

-0.01

-0.17

17

-4

-0.02

-0.2

10

-3

-0.03

-0.32

10.6

-2

-0.04

-0.51

12.75

-1

-0.1

-1.2

12

  1. I used a Milliammeter to measure the current instead of the ammeter because it’s more accurate.
...read more.

Conclusion

an class="c1">60

4

5.7

3.6

63

5

5.2

3.41

65

-6

0

-4.7

0

-5

0

-4.7

0

-4

0

-4.68

0

-3

0

-4.68

0

-2

0

-4.68

0

-1

0

-4.66

0

Component C

Resistance

Voltage

Current

Tries

90.7

3.92

0.043

1

70.4

2.22

0.031

2

57.9

1.46

0.025

3

48.07

1

0.02

4

39.88

0.71

0.017

5

90.2

-3.88

-0.043

-6

64.4

-1.83

-0.028

-5

50.2

-1.1

-0.021

-4

42.8

-0.81

-0.018

-3

33.9

-0.54

-0.015

-2

26

-0.36

-0.013

-1

Conclustion:

Evaluation:

In the first component I used an Ammeter and the second two experiments I used a Milliammeter because it is more accurate and the figures in components B and C are very small so I thought it would be more accurate if I used the Milliammeter.

...read more.

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