Question

Why are the measured values of the resistors different from the nominal values?

Answer 1

A certain tolerance is made for resistors that are sold, though these are not guaranteed to be near to a specific value than that percentage of precision.

 

Nowadays, resistors are made by loads, sorted automatically and are aimed at a specific value. They run resistors it through an automated Ohmmeter if they try to make one that is 27000 Ohms. They put on a marking that says it is 27000 Ohms +-20% if it is 20% higher or lower. They put on a marking that says it is 27000 Ohms +- 1%, if it happened to be within 1% of 27000 Ohms. The less accurate ones are sold less than the more accurate ones.

Answer 2

The value for a resistor and its measured value can be different due to chemical and mechanical factors that may occur during production of the resistor.

A resistor is an electronic component that can be used to control the flow of current in parts of a circuit. Its nominal value is the value given by the color codes on it, while its measured value is the actual resistance it has.

During production, mechanical and chemical variations can occur. Thus causing the difference between the nominal and measured values of the resistor.

The deviation from the nominal value is sometimes/often specified on the resistor by manufacturers. This deviation is sometimes referred to as the tolerance of the resistor.

Therefore considering the question, the answers are chemical and mechanical factors.

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