Resistor – the object electric circuit which serves to reduce the current in it. Also the resistors are used to reduce the stress on individual sites and the separation of current into its components. On electrical diagrams, resistors are indicated by small rectangles with a pair of leads (one with two opposing sides). Abroad resistors are shown with a broken line.

The Resistors have three main parameters:

- Nominal impedance (resistor values).
- The Tolerance.
- Power dissipation.

Resistor Values – the value of their nominal resistance, that is, the value specified by the manufacturer. Nominal impedance is measured in ohms. The resistors are used in almost all sectors containing a little electrical devices. This causes a huge range of resistance values. However, there are resistor values that are universal.

To Manufacture a resistor with a certain exact denomination is very difficult, so we use this value as tolerance. For example, if the specified nominal resistance equal to 10 Ohms, in fact it will be approximately 9,98 - 10.1 Ohm. This possible error is called the tolerance and is measured in percents.

Power dissipation – one of the most important determinants of the resistor. Explain this value. A resistor through which an electric current is constantly heated. This depends on the power supply. Each resistor has a certain temperature limit, beyond which it overheats and burns. Power dissipation-this is the power value of the electric current, which resistor will burn. As resistor values, power dissipation – is a constant for each of them. It is specified by the manufacturer. In electrical circuits power dissipation of the resistors should also be specified. To refer to use inclined, horizontal and vertical lines. Depicted in the icon of the resistor lines are special combinations, for different values of power. Standard values in small schemes fluctuate between 1/8 watt and five watt. Power dissipation for any resistor, you can calculate from Ohm's law for subcircuit. To determine it we need to know the amperage in the circuit and the nominal value of the resistor.

All of the nominal resistance values is standardized. That is, there are some standard resistor values. These values, in turn, are grouped into the ranks of the resistors. For DC such series have 6: E6, E12, E24, E48, E96, Е192.

For variables, the same currents are used only in the ranks of E6 and occasionally E3. The numbers in the titles of the rows indicate the number of possible values in a given row. For example, a number of denominations E6 involves only the next possible resistance: 1,0; 1,5; 2,2; 3,3; 4,7; 6,8.

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