resistor and its characteristics



resistor is called a passive component, since the current is reduced after passing through it.The role of the resistor circuits is enormous: it ensures stable operation of the amplifier stages and allows transistors to control the voltage in electric circuits.

Resistor - linear element, as its current-voltage characteristic (dependence of the current on the applied voltage) is a straight line drawn from the origin.The tangent of the slope of this line with the abscissa inversely proportional to the resistance.

resistance - the main characteristics of the resistor.It is measured in ohms, kiloomah, megohms, etc.In fact, any electrical circuit element has a resistance, and the current passing therethrough is decreased.However, the resistor is the main feature that sets it apart from all the other
elements.

It is made from various materials which depend on the difference between the real resistance and what is written on the body.The fact that these two values ​​have slightly different real devices.

resistance value is indicated on the resistor.No less important characteristic is the power dissipated in it - the thermal energy that appears at the time of the passage of electric current.If it is excessively large, the resistor may be damaged.It's like a blown mains plug in the apartment when you connect all the devices simultaneously.To avoid breaking resistor on it, in addition to the resistance value, also indicate the maximum allowable power dissipation.Resistors for different circuits are selected on the basis of these two parameters.

Marking resistors



Modern resistors are quite small in size, so do not always get fully specify the resistance that they can have.Read as a tiny inscription will be problematic.For convenience, use special reductions.The letter corresponds to specific units (R - Ohms, K - kiloomah, M - megohms, etc.).On the resistor will be sufficient to indicate all three characters.

resistors, which are available in American plants are labeled differently.The first two digits indicate the denomination, and the third - the number of zeros.For example, 150 represents 15 ohms and 363 - 36 k.

Recently, the company engaged in production of resistors, abandoning old ways of marking and labeling on the go with the help of color.It is easier to apply in a fully automated production.Each color corresponds to a certain factor and the degree of accuracy.For the most accurate resistors are applied to six color bands.The first two always indicate nominal resistance.