Resistor Testing

Resistor Testing 

Resistors are a common component used in electronic circuits, but when building a circuit, it is important to pay attention to whether its value is correct or faulty. You can also find its value through color coding, or some have their values marked on them. Let's learn how to find the value of any resistor and whether it is okay or faulty.

Here are the steps on how to check the value of a resistor:

Check the color code. Resistors are color-coded, which means that the value of the resistor is indicated by the colors of the bands on its body. The first two bands represent the first two digits of the resistor's value, the third band represents the multiplier, and the fourth band represents the tolerance.

For example, a resistor with the following color bands:

Brown (1)
Black (0)
Red (2)
Gold (5%)
Would have a value of 100 ohms with a tolerance of 5%.

Use a multimeter.

Step 1

First, set the black probe of the multimeter to Common Mode and the red probe to Resistance Mode.
Select the value from Low Value to High Value to find out its value.
If the value of the resistor is known, then in this condition, select the range of the Multimeter on the value that is ahead of the actual value and check.

Step 2

To determine if a resistor is faulty, connect it in Ohms (Ī©) and Common (Com) mode on your multimeter. If the displayed value is 0 or infinite, the resistor is faulty. If the value falls within the tolerance marked on the resistor, it is functioning properly.

Precautions:
  • Do not touch the leads of the multimeter with your hands.
  • If the resistor is in the circuit, turn off the power of the circuit before checking.

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