# 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

Ket:
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.

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".

Thank you for visiting the Chip Piko website. Hopefully this article can add to our insight in a series of series.