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electrical_engineering_and_electronics_1:block03 [2025/09/28 23:32] – [Learning objectives] mexleadminelectrical_engineering_and_electronics_1:block03 [2025/10/10 21:40] (aktuell) – [Preparation at Home] mexleadmin
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   * Read **practical resistor values** (E-series, RKM code, color code); relate nominal value, tolerance, and power rating.   * Read **practical resistor values** (E-series, RKM code, color code); relate nominal value, tolerance, and power rating.
 </callout> </callout>
 +
 +===== Preparation at Home =====
 +
 +Well, again 
 +  * read through the present chapter and write down anything you did not understand.
 +  * Also here, there are some clips for more clarification under 'Embedded resources' (check the text above/below, sometimes only part of the clip is interesting). 
 +
 +For checking your understanding please do the following exercises:
 +  * 1.6.4
 +  * 1.6.6
 +  * 1.7.2
  
 ===== 90-minute plan ===== ===== 90-minute plan =====
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-==== Efficiency ==== 
- 
-The usable (= outgoing) $P_{\rm O}$ power of a real system is always smaller than the supplied (incoming) power $P_{\rm I}$.  
-This is due to the fact, that there are additional losses in reality. \\ 
-The difference is called power loss $P_{\rm loss}$. It is thus valid: 
- 
-$P_{\rm I} = P_{\rm O} + P_{\rm loss}$ 
- 
-Instead of the power loss $P_{\rm loss}$, the efficiency $\eta$ is often given: 
- 
-$\boxed{\eta = {{P_{\rm O}}\over{P_{\rm I}}}\overset{!}{<} 1}$ 
- 
-For systems connected in series (cf. <imgref BildNr23>), the total resistance is given by: 
- 
-$\boxed{\eta = {{P_{\rm O}}\over{P_{\rm I}}} = {\not{P_{1}}\over{P_{\rm I}}}\cdot {\not{P_{2}}\over \not{P_{1}}}\cdot {{P_{\rm O}}\over \not{P_{2}}} = \eta_1 \cdot \eta_2 \cdot \eta_3}$ 
- 
-<WRAP> 
-<imgcaption BildNr23 | Power flow diagram> 
-</imgcaption> 
-{{drawio>Leistungsfluss.svg}} 
- 
-</WRAP> 
- 
-~~PAGEBREAK~~ ~~CLEARFIX~~ 
 ==== Passive vs. active sign convention ==== ==== Passive vs. active sign convention ====