Characteristics of various types of resistors – Characteristics Of Various Types Of Resistors are influenced by the material used. The resistance of the composition resistor is not stable due to the influence of temperature, if the temperature rises then the resistance drops. Not suitable when used in high voltage and large current electronic circuits.
The resistance of a composition resistor differs between the reality of its nominal resistance. If the value difference of up to 10% is certainly not good in a circuit that requires high accuracy. The variable resistors vary according to changes in the settings. Variable resistors with mechanical regulators, setting by light, setting by temperature or other settings.
If the value changes, the potentiometer resistance is proportional to the sliding contact position, this kind of potentiometer is called a linear potentiometer. But if the change in the value of resistance is not proportional to the position of the sliding contact called the logarithmic potentio.
In theory a resistor is said to have pure resistance but in practice a resistor has additional properties, namely inductive and capacitive properties. Basically low value resistors tend to have inductive properties and high-value resistors have additional capacitive properties.
Temperature has a significant influence on an obstacle. In the conductor there is a very large number of free electrons, and any heat energy applied to it will have little effect on the total number of free carriers. In fact heat energy will only increase the intensity of random movements of particles in the material which makes it more difficult for electrons to flow in general in any one direction specified.
The result is a good conductor, an increase in temperature will result in an increase in the price of prisoners. As a result, conductors have a positive temperature coefficient.
Flow -> heat
HR = I 2 Rt [joule]
Q = mc (Ta-T)
Q = 0.24 I 2 R t [calories]
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