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Black Box Electronics Coursework

Extracts from this document...

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.

Ohmic Conductor:

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)

Diode:

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 (…..).

Results:

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.

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.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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