Circuit lab 2 identification of resistance with color code and multi-meter@taj
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Circuit lab 2 identification of resistance with color code and multi-meter@taj
.
This lecture is from my class lectures in IIT-JU.
.
Find me:
Website: https://www.tajimiitju.blogspot.com
Linked in: https://www.linkedin.com/in/tajimiitju
Researchgate: https://www.researchgate.net/profile/Tajim_Md_Niamat_Ullah_Akhund
Youtube: https://www.youtube.com/tajimiitju?sub_confirmation=1
Slideshare: https://www.slideshare.net/TajimMdNiamatUllahAk
Facebook: https://www.facebook.com/tajim.mohammad
Gitlab: https://gitlab.com/users/tajimiitju
Google+: plus.google.com/+tajimiitju
Email: tajim.mohammad.3@gmail.com
Twitter: https://twitter.com/Tajim53
Page 1 of 4 Direct Current (DC) Circuits Introduct.docxbunyansaturnina
Page 1 of 4
Direct Current (DC) Circuits
Introduction
In this lab, we will get acquainted with various components of electrical circuits. We will learn:
how to make simple circuits using a battery (or power supply), light bulbs, resistors; draw the
circuit diagram; how to use color code to read the resistance of the resistor; how to use the
measuring tools like a digital multimeter – DMM; how to connect the DMM to measure the
resistance, voltage and current. We will learn how to simplify the circuit by replacing the circuit
diagram with an equivalent one. Text reference: Young and Freedman §§ 26.1, 26.3.
We will investigate the behavior of direct current (DC) electrical circuits. We will study the flow
of electrical current in a circuit from the battery or power supply, through the wires, and through
various combinations of light bulbs and/or resistors.
A simple electrical circuit usually has a power (energy) source such as a battery or power supply
and resistors such as a light bulb or a carbon resistor. Here are the symbols for some electrical
components you may see in circuit diagrams of the lab manuals of this lab course:
A closed circuit is a path along which current carriers (electrons in conductors) can flow. Current
does not flow in an open circuit. A circuit in which there is a single pathway is known as a series
circuit whereas a circuit that has multiple (more than one) possible paths is known as a parallel
circuit.
Resistors impede the flow of current in a circuit. We assume that connecting leads (conductors)
have negligible resistance, while the insulators have very large resistance. Many resistors obey
Ohm’s Law (V = IR), which states that the current I through a resistance R is proportional to the
voltage V across the resistor. We will study Ohm’s law in the next lab class experiment.
Part 1. Light Bulbs
1. Simple circuit
Make a simple circuit using a battery or DC power supply, a light bulb (in its holder), and some of
the connecting leads.
a) What happens to the light bulb when you close the circuit?
___________________________________________________________________
b) Draw a circuit diagram representing your circuit using the symbols from above:
Try to remember how brightly the bulb is shining in step 1.
Page 2 of 4
2. Light bulbs in Series
Now add a second identical bulb in series (you will need to disconnect your circuit first).
a) Draw a proper diagram representing your circuit. What do you observe about the light
intensity (brightness) in each bulb compared to a single bulb in the previous step?
__________________________________________________________________
b) What happens if you remove one of the light bulbs from its holder?
_________________________________________________________________
3. Light bulbs in Parallel
Disconnect the circuit from step 2 and add the second bulb in parallel to the first.
a) Draw a proper diagram repres.
The file contains the Resistance of Electricity and how it affects greatly on the technology that we are using nowadays. Together with some calculation and trivia, I hope will enjoy watching and learning the presentation
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Pt100 con
1. Where do those wires go – PT100
1. A PT100 normally has 3 wires. It is in simple terms a resistance that changes with temperature.
2. It is called a PT100 because at 0 deg C it will measure 100 ohms.
3. At ambient it will be around 138 ohms.
4. Because a very small change in resistance happens with each degree in temperature the
added resistance of the wires will cause an error when connecting to a temperature controller.
5. In order to eliminate the effect of the wires we need at least 3 wires.
6. The controller will measure the wire resistance and subtract it to leave us with just the PT100
resistance.
7. In our sketch below we have the following resistances, Rpt, R1, R2 and R3
8. Mathematically the controller does the following calculation...
9. Rpt = “the measurement between A and B” less “the resistance measured between B and C”
10. So Rpt = (R1 + Rpt + R2) – (R2 + R3)
11. So it is important where each wire is connected.
12. Normally the wires will be coloured so that 2 wires are the same colour and a third is different.
13. So wire A could be red and wire B and wire C may be another colour say black
14. Although not good practice electricians often extend PT100 wires with conventional copper wire
which is fine, but not adhering to the colour code of two one colour and the third another.
15. If you are trying to identify which wire goes where start off and measure the resistances
between all 3 wires and use the measurement to identify the wires.
16. The measurement between wire A and wire B will be over 100 ohms.
17. The measurement between wire A and wire C will be the same.
18. The measurement between wire B and wire C will be low, just the resistance of the wire itself.
19. You will now have identified which wire is which. Now connect them to the appropriate
terminals on the controller.
20. So the marking on the controller is normally marked B, B and A
21. So the two same colours go on B and the other colour goes on A