Caupayan, Jedda Anne G. BSEd-4
Potentiometer
Have
you wondered why you can adjust the volume in your television as well as its
brightness? Well, it is because of this electronic device that plays a very
important role in our homes and makes our lives easier and simpler. It is no
other than the great potentiometer.
Definition:
Potentiometer
is an electronic device that controls the rate of resistance. It is a kind of
resistor that is called as “variable resistor”. It has a variable resistance
with the help of its simple knob. It is also a three-terminal resistor.
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The main parts and functions of a potentiometer
are the following:
•
Terminal 1 – the one that will
provide the grounding
•
Terminal 2 – the input of
potentiometer
•
Terminal 3 – the output of potentiometer
•
Shaft – changes the amount of resistance on either side of the wiper
which is connected to the center pin of the potentiometer
•
Wiper – determines the output
voltage of the potentiometer
•
Resistive strip – the heart of potentiometer
Types:
There
are two types of potentiometer, the rotational potentiometer and the linear
potentiometer.
•
Rotational potentiometer – a type of potentiometer that adjusts the
resistance from 0 degree and about 240 to 330 degrees maximum
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•
Linear potentiometer – a type of potentiometer that adjusts the
resistance according to the displacement of the position of the slider or wiper
Applications:
We
can usually observe and apply potentiometer in the remote control of our
televisions to adjust the volume and brightness. We can also use this in all
music systems as a volume knob and also as fan regulators.
Experimental data
Objectives: At the end of the lesson we are
expected to do the following:
a.
measure the voltage of the bulb with the use of potentiometer;
b.
compare the voltages of the bulb with closed pot, half-opened pot and opened
pot
Materials:
potentiometer
bulb
multitester
AC-DC
converter
•
POT without FIXED
RESISTOR RBULB= 20 Ω
|
VOLTAGEOUT (V)
|
VOLTAGEDROP (v)
|
||
|
CLOSED POT
|
HALF-OPENED POT
|
OPENED POT
|
|
|
3.1 V
|
2.8 V
|
1.4 V
|
0V
|
|
5.2 V
|
4.6 V
|
2.2 V
|
0V
|
|
7.2V
|
6.8 V
|
3.5 V
|
0V
|
|
9.2V
|
9.0 V
|
4.3 V
|
0V
|
|
12V
|
10 V
|
4.8 V
|
0V
|
|
BRIGHTNESSBULB
|
BRIGHT
|
DIM
|
NO LIGHT
|
•
POT with FIXED
RESISTOR; R= 1100 Ω RBULB= 20 Ω
|
VOLTAGEOUT (V)
|
VOLTAGEDROP (v)
|
||
|
CLOSED POT
|
HALF-OPENED POT
|
OPENED POT
|
|
|
3.2 V
|
2.2 V
|
1.1 V
|
0V
|
|
5.2 V
|
3.9 V
|
1.8 V
|
0V
|
|
7.4 V
|
5.8 V
|
2.7 V
|
0V
|
|
9.4 V
|
7.6 V
|
3.8 V
|
0V
|
|
12V
|
8 V
|
4.2 V
|
0V
|
|
BRIGHTNESSBULB
|
BRIGHT
|
DIM
|
NO LIGHT
|
Conclusion
This activity shows that the
voltage is low if the potentiometer is open and it is high when the
potentiometer is close.
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from:
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