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Calculation of series resistors in basic electronic circuits

Penjelasan Resistor Seri

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:

Rtotal = R1 + R2 + R3 + ..... + Rn

R1 = Resistor 1
R2 = Resistor 2
R3 = Resistor 3
Rn = 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.

Perhitungan Resistor Seri Rangkaian Elektronika Dasar

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:
  1. Find Rtotal

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

  2. 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

  3. Find Voltage at R1 

    VR1 =  I * R1 = 1mA * 3K
             = 3V

  4. Find Voltage at R2

    VR2 = I * R2
            = 1mA * 2K
            = 2V

  5. 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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