Calculation of series resistors in basic electronic circuits
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Calculation of series resistors in basic electronic circuit – A series resistor is a resistor that is connected in series to another resistor. Two resistors, three resistors and so on.
In addition, resistors can also be connected in parallel and a combination of the two. This is the basics of electronics science.
The basic series resistor circuit looks like this:
The functions of the series resistor are:
 Increase a certain resistance value.
 Voltage Divider
A. Adding Specific Resistance Values.
Why do we have to increase the resistance value?
Resistors have a standard value in their production. Resistor manufacturing companies, do not print resistors with many values.
Consider the following pdf, which contains 168 lists of resistor values with a tolerance of 5% that are commonly produced:
For example in our circuit design, a resistor with a value of 12.5K ohms is needed.
However, in the market we get resistors with a value range of 12K ohms, 13K ohms.
How can we make a resistor with a value of 12.5K ohms?
The trick is to add a resistor of 12K ohms + 500 ohms = 12.5K ohms.
The resistor series formula is:
R_{total} = R_{1} + R_{2} + R_{3} + ..... +
R_{n}
Ket:
R_{1} = Resistor 1
R_{2} = Resistor 2
R_{3} = Resistor 3
R_{n} = Resistor n
*n = next value
B. Series Resistors As Voltage Dividers
Things to remember from this series are:
“The voltage of each resistor is different, while the current of each resistor is the same“.
By their nature, the resistor will cause a voltage drop or voltage drop across the series resistor.
Notice in the image below, there are three resistors connected in series.
The voltage applied to points A and B is 10V.
Each resistor has a resistance value of 3K, 2K, and 5K Ohm connected in series.
When measuring each voltage on the resistor using a multimeter, the results are 3V, 2V and 5V.
The explanation:

Find Rtotal
Rtotal = R1 + R2 + R3
= 3K + 2K + 5K = 10K

Find Current
I = V/R
= 10V / 10K ohm
= 0.001 A = 1mA
This means that the current passing through R1, R2, and R3 is 1mA.
The current remains the same in the series resistor circuit.
Itotal = IR1 = IR2 = IR3

Find Voltage at R1
VR1 = I * R1 = 1mA * 3K
= 3V
 Find Voltage at R2
VR2 = I * R2
= 1mA * 2K
= 2V
 Find Voltage at R2
VR2 = I * R2
= 1mA * 5K
= 5V
At this point, you understand, right?
If you still don't understand about the calculation of resistor as a voltage divider, you can read "Calculator & Formulas for Voltage Divider for Voltage Divider for Resistor".
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