OHMMETER SCALE READING VIDEO PRESENTATION
Summary
TLDRIn today's lesson, Mr. Ronald A. Gonzalez teaches about ammeter scale reading. He explains the non-linear scale, showing how to read resistance values from right to left, with different increments per range. He covers scales from 0 to 200 in 0.2 increments, 2 to 10 in 0.5 increments, 10 to 20 in 1 increment, 20 to 50 in 2 increments, and so on, up to 200 to 500 in 100 increments. He also discusses using the selector knob to choose the correct multiplier for high resistance values and provides a formula to calculate actual resistance. Examples are given to demonstrate how to apply the range multiplier to get the final resistance value.
Takeaways
- 📝 The video is a tutorial on how to read an ammeter scale, which is used to measure electrical current.
- 📝 The ammeter scale is non-linear, with different increments of values per line depending on the range.
- 📝 The scale ranges from 0 to 200 with varying increments: 0.2 from 0 to 2, 0.5 from 2 to 10, 1 from 10 to 20, 2 from 20 to 50, 5 from 50 to 100, 20 from 100 to 200, and 100 from 200 to 500.
- 📝 To read the resistance value, one must start from the right and move to the left, as the scale is descending.
- 📝 For high resistance values, a selector knob is used to choose the appropriate multiplier or resistance range.
- 📝 The formula to calculate the resistance value is: Resistance Value = Actual Reading × Resistance Range or Multiplier.
- 📝 The video provides an example of how to read the ammeter scale at different ranges, such as 50 to 100 and 10 to 20.
- 📝 The actual reading is determined by counting the increments from the starting point of the range to the pointer's position.
- 📝 The resistance range multipliers available are: ×1, ×10, ×100, ×1K, and ×10K.
- 📝 The video concludes with examples demonstrating how to apply the formula to get the resistance value for different ranges and actual readings.
Q & A
What is the topic of the lesson conducted by Ronald A. Gonzalez?
-The topic of the lesson is about ammeter scale reading.
Where is the ammeter scale located on the meter panel?
-The ammeter scale is located in the top most part of the meter panel.
How is the scale of an ammeter described in terms of its numerical order?
-The scale of an ammeter has a descending order of numbers from left to right.
What is the starting point for reading resistance values on an ammeter?
-Reading resistance values starts from zero on an ammeter.
Why are the gaps between numbers on an ammeter scale not equally divided?
-The gaps between numbers on an ammeter scale are not equally divided because it is a non-linear scale.
What is the value per line from zero to two on the ammeter scale?
-The value per line from zero to two on the ammeter scale is 0.2.
How do you calculate the resistance value when using an ammeter?
-The resistance value is calculated by multiplying the actual reading by the resistance range or multiplier.
What are the different multipliers or resistance ranges available on an ammeter?
-The different multipliers or resistance ranges available are: times one, times 10, times 100, times 1K, and times 10K.
What is the formula to get the resistance value as mentioned in the script?
-The formula to get the resistance value is: Resistance value = Actual reading multiplied by Resistance range or multiplier.
In the example provided, what is the actual reading when the pointer is between 50 and 100 on the scale?
-The actual reading when the pointer is between 50 and 100 on the scale is 65 ohms.
What is the result of the actual reading of 65 ohms when multiplied by the 10K multiplier?
-The result of the actual reading of 65 ohms when multiplied by the 10K multiplier is 650k ohms.
Outlines
📏 Understanding Ammeter Scale Reading
In this segment, the instructor, Ronald A. Gonzalez, introduces the concept of ammeter scale reading. He explains that the scale is located at the top of the meter panel and is arranged in descending order from left to right. The instructor clarifies that readings start from zero and increase to infinity, and the scale is non-linear, meaning the gaps between numbers are not equal. He details how to read the values: from 0 to 2, each line represents an increase of 0.2; from 2 to 10, each line represents an increase of 0.5; from 10 to 20, each line represents an increase of 1; from 20 to 50, each line represents an increase of 2; from 50 to 100, each line represents an increase of 5; and from 100 to 200, each line represents an increase of 20. The instructor also explains how to select the appropriate multiplier or resistance range using the selector knob, which includes options like times one, times 10, times 100, times 1K, and times 10K. He provides a formula to calculate the resistance value, which is the actual reading multiplied by the resistance range or multiplier.
🔍 Practical Examples of Ammeter Scale Reading
The second paragraph provides practical examples to demonstrate how to read the ammeter scale. The instructor uses a pointer on the scale to show how to read values. For a pointer between 50 and 100, where each line represents a value of 5, the actual reading is determined to be 65 ohms. The instructor then shows how to multiply this reading by different ranges to get the resistance values: 65 ohms multiplied by 10 ohms equals 650 ohms, by 100 ohms equals 6.5 K ohms, by 1K ohms equals 65K ohms, and by 10K ohms equals 650K ohms. In the second example, the pointer is between 10 and 20, with each line representing a value of 1. The actual reading is 12 ohms, which when multiplied by different ranges, results in 120 ohms, 1.2 K ohms, 12 K ohms, and 120K ohms respectively. These examples illustrate the process of reading the ammeter scale and calculating the resistance values based on the selected range.
Mindmap
Keywords
💡Ammeter
💡Scale Reading
💡Non-Linear Scale
💡Resistance
💡Multiplier
💡Resistance Range
💡Actual Reading
💡Formula
💡Selector Knob
💡Ohms
💡Example
Highlights
Introduction to ammeter scale reading
Ammeter scale is non-linear with descending order of numbers
Reading resistance values from right to left
Scale values are not equally divided
Value per line from zero to two is 0.2
Value per line from 2 to 10 is 0.5
Value per line from 10 to 20 is 1
Value per line from 20 to 50 is 2
Value per line from 50 to 100 is 5
Value per line from 100 to 200 is 20
Value per line from 200 to 500 is 100
Explanation of multipliers for high resistance values
Formula to calculate resistance value
Example of calculating resistance with a 10K multiplier
Explanation of resistance range selection
Example calculation for a pointer at 50-100 scale
Example calculation for a pointer at 10-20 scale
Transcripts
good afternoon class my name is Ronald A
Gonzalez your daily teacher or today
[Music]
our topic for today is all about amateur
scale reading
I have an example of ammeter scale
as you can see the scale of ammeter is
located in the top most part of the
meter panel you have noticed a
descending order of number from left to
right in practice reading
values only start from zero
therefore
we will read resistance values from
right to left which is 0 to Infinity
since we will read resistance values
from right to left C to it that the gaps
between numbers are not equally divided
because the scale of ammeter is a
non-linear scale each scale has a value
with respect to its nearest number
now let's read the value per line of
scale of ammeter from zero to two the
value per line is
0.2 each line you need to add 0.2
0.2 0.4 0.6
0.81 1.2 1.4 1.6 1.8 and 2.
from 2 to 10 the value per line is 0.5
each line you need to add
0.5 to 2.5 3 3.5 or
4.5
6.5 7
7.58
8.59 9.5 and lastly 10.
next value per line from 10
to 20 the bar Loop per line is 1.
each line you need to add one
10 11 12
14 15 15
16 17 18 19
20.
next value per line
from
20 to 50 the value per line is 2. each
line you need to add two
twenty twenty two
24 26
28 30 32
34
36 38 40 42 44
46 48 and lastly 50. next value per line
from 50
to 100 the value per line is 5. each
line you need to add 5
[Music]
50 55 60
65 70 75 80 85 90 95
and lastly 100
and the next value per line
from
100 to 200 the value per line is 20.
each line you need to add
20. for example
100
120
140
160
180 and 200.
the next value per line from 200
to 500 the value per line is 100
each line you need to add 100
for example 200
[Music]
300
400 and 500.
[Music]
example of
ometer scale by the way class if you're
going to test the high value of
resistance you need to select the
multiplier or resistance range using the
selector knob and these are the
following multiplier
times one times 10 times 100 times 1K
and lastly times 10 K
I have a formula to get the resistance
value
resistance value is equal to actual
reading multiplied by resistance range
or D multiplier for example the actual
reading is 20 ohms multiplied by 10K 10K
ohms the answer is 200k ohms
[Music]
now let's proceed to the example example
number one
a pointer pointing in the scale of 50 to
100 the volume per line is 5 from 50
each line you need to add 5 50 55 60 65
therefore the actual reading is 65 ohms
now let's multiply it to the given range
65 ohms multiply by 10 ohms is equal to
680 ohms 65 ohms multiplied by 100 ohms
is equal to 6.5 K ohms 65 ohms
multiplied by 1K ohms is equal to
65k ohms and lastly 65 ohms is equal
multiplied by
10K ohms
is equal to
650k ohms
sample number two the pointer pointing
in a scale of 10 to 20. the value per
line is 1 from 10 each line you need to
add 1 10 11 and lastly 12 so therefore
the actual reading is 12 ohms now let's
multiply it to the given range 12 ohms
times 10 ohms is equal to 120 ohms
12 ohms times 100 ohms is equal to 1.2 K
ohms and 12 ohms multiplied by 1K ohms
is equal to 12 K ohms and lastly 12 ohms
multiplied by 10K ohms is equal to
120k ohms
foreign
[Music]
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