Unterschiede
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circuit_design:uebung_2.1.2 [2023/03/09 15:23] mexleadmin [Bearbeiten - Panel] |
circuit_design:uebung_2.1.2 [2023/12/01 01:18] (aktuell) mexleadmin |
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- | You want to drive a red light-emitting diode on a voltage source of $U_s = 5.0 ~V$ with a current of $I_D = 20 ~mA$. On the web, you have found a voltage drop of $U_D = 2.3 ~V$ for red LEDs. Now you want to know which resistor from the E12 series (available to you) is the correct | + | You want to drive a red light-emitting diode with a voltage source of $U_{\rm s} = 5.0 ~\rm V$ and a current of $I_{\rm D} = 20 ~\rm mA$. |
+ | You have found for red LEDs a voltage drop of $U_{\rm D} = 2.3 ~\rm V$ based on a web search. Now you want to know which resistor | ||
- | - Draw the circuit of the LED with series resistor and plot the voltages. | + | - Draw the circuit of the LED with a series resistor and plot the voltages. |
- | - What must be the value of the series resistor $R_V$ to give the voltage drop $U_S$ above? | + | - What is the value of the series resistor $R_\rm V$ to get the given voltage drop $U_\rm S$? |
- | - In the red LED datasheet | + | - Find the relationship between forward voltage and forward current in the datasheet of the red LED {{elektronische_schaltungstechnik: |
- Briefly compare the different results considering the [[https:// | - Briefly compare the different results considering the [[https:// | ||