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| Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
| electrical_engineering_1:preparation_properties_proportions [2024/10/10 15:15] – mexleadmin | electrical_engineering_1:preparation_properties_proportions [2025/09/15 15:27] (aktuell) – mexleadmin | ||
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| ====== 1 Preparation, | ====== 1 Preparation, | ||
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| The values of the resistors are standardized in such a way, that there is a fixed number of different values between $1~\Omega$ and $10~\Omega$ or between $10~\rm k\Omega$ and $100~\rm k\Omega$. These ranges, which cover values up to the tenfold number, are called decades. In general, the resistors are ordered in the so-called {{wp>E series of preferred numbers}}, like 6 values in a decade, which is named E6 (here: $1.0~\rm k\Omega$, $1.5~\rm k\Omega$, $2.2~\rm k\Omega$, $3.3~\rm k\Omega$, $4.7~\rm k\Omega$, $6.8~\rm k\Omega$). As higher the number (e.g. E24) more different values are available in a decade, and as more precise the given value is. | The values of the resistors are standardized in such a way, that there is a fixed number of different values between $1~\Omega$ and $10~\Omega$ or between $10~\rm k\Omega$ and $100~\rm k\Omega$. These ranges, which cover values up to the tenfold number, are called decades. In general, the resistors are ordered in the so-called {{wp>E series of preferred numbers}}, like 6 values in a decade, which is named E6 (here: $1.0~\rm k\Omega$, $1.5~\rm k\Omega$, $2.2~\rm k\Omega$, $3.3~\rm k\Omega$, $4.7~\rm k\Omega$, $6.8~\rm k\Omega$). As higher the number (e.g. E24) more different values are available in a decade, and as more precise the given value is. | ||
| - | For larger resistors with wires, the value is coded by four to six colored bands (see [[https:// | + | For larger resistors with wires, the value is coded by four to six colored bands (see __ BROKEN-LINK: |
| < | < | ||
| Zeile 738: | Zeile 738: | ||
| * Besides the linear term, it is also possible to increase the accuracy of the calculation of $R(\vartheta)$ with higher exponents of the temperature influence. This approach will be discussed in more detail in the mathematics section below. | * Besides the linear term, it is also possible to increase the accuracy of the calculation of $R(\vartheta)$ with higher exponents of the temperature influence. This approach will be discussed in more detail in the mathematics section below. | ||
| * These temperature coefficients are described with Greek letters: $\alpha$, $\beta$, $\gamma$, ... | * These temperature coefficients are described with Greek letters: $\alpha$, $\beta$, $\gamma$, ... | ||
| - | * Sometimes in the datasheets the value $\alphe$ is named as TCR (" | + | * Sometimes in the datasheets the value $\alpha$ is named as TCR (" |
| <WRAP group>< | <WRAP group>< | ||
| Zeile 1042: | Zeile 1042: | ||
| This process is also reversible: When cooled down, the conducting paths get re-connected. | This process is also reversible: When cooled down, the conducting paths get re-connected. | ||
| These components are also called **polymer positive temperature coefficient** components or PPTC. \\ | These components are also called **polymer positive temperature coefficient** components or PPTC. \\ | ||
| - | In the diagram below the internal structure and the resistance over the temperature are shown (more details about the structure and function can be found [[https:// | + | In the diagram below the internal structure and the resistance over the temperature are shown (more details about the structure and function can be found __ BROKEN-LINK: |
| {{drawio> | {{drawio> | ||