==== Bridge Rectifier ====
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In <imgref Fig-8_V3-Bridge-rectifier> the circuit of a bridge rectifier is shown. Enter the current arrows correctly. Draw the connection between the oscilloscope and the circuit in order to measure the output voltage $u_{\rm R}$ at the rectifier.
Explain why one cannot measure the secondary voltage of the transformer and the output voltage of the bridge rectifier at the same time. \\ \\ \\
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{{drawio>Fig-8_V3-Bridge-rectifier>.svg}}\\
<WRAP centeralign> <imgcaption Fig-8_V3-Bridge-rectifier> | Bridge rectifier> </imgcaption> </WRAP> 
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Build the circuit on the breadboard and connect the oscilloscope. Then sketch the voltage curve before and after the bridge rectifier, i.e. the voltages $u_{rm Sec}$ and $u_{\rm R}$. However, note that you connect the ground of the oscilloscope before or after the bridge rectifier for the respective measurement. Also give the oscilloscope settings used.

<wrap left>
{{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\
<imgcaption Fig-9_V3-Screen-image-bridge-rectifier-wo-cap> | Screen image bridge rectifier without capacitor> </imgcaption> 
</wrap>

Channel 1:  $ \frac{V}{\rm DIV} =  $ \\ \\
Channel 2:  $ \frac{V}{\rm DIV} =  $ \\ \\
Time basis: $ \frac{T}{\rm DIV} =  $ \\ 

~~PAGEBREAK~~ ~~CLEARFIX~~

Now connect a capacitor (electrolytic capacitor) with 100 µF in parallel to the resistor $R_{\rm L}$ and sketch the voltage curve of $u_{rm Sec}$ and $u_{\rm R}$ again in <imgref Fig-9_V3-Screen-image-bridge-rectifier-wo-cap> with a different color. \\
**Warning: When using an electrolytic capacitor (Elko) the correct polarity must be observed!**
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Measure the following values with the help of the oscilloscope in the circuit and enter the results into <tabref Table-2-Bridge-Rectifier_V3> (100 µF):

{{drawio>Table-2-Bridge-Rectifier_V3.svg}}\\
<tabcaption Table-2-Bridge-Rectifier_V3 | Bridge-Rectifier measured values> </tabcaption>
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Consider a measure by which the ripple voltage can be reduced. Draw the circuit with your found solution into <imgref Fig-9_V3-Bridge-rectifier-reduction-ripple> and measure the voltage curves $u_{rm Sec}$ and $u_{\rm R}$. Enter these into the screen image <imgref Fig-9_V3-Screen-image-bridge-rectifier-wo-cap> with a third color.

<wrap right>
{{drawio>Fig-9_V3-Bridge-rectifier-reduction-ripple>.svg}}\\
<imgcaption Fig-9_V3-Bridge-rectifier-reduction-ripple> | Bridge rectifier ripple reduction> </imgcaption>
</wrap>

~~PAGEBREAK~~ ~~CLEARFIX~~
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Carry out the corresponding measurements – as above – again on the bridge rectifier. These were the secondary-side voltage of the transformer $û_{\rm Sec}$, the frequency of the secondary transformer voltage $f_{\rm Sec}$, the peak-to-peak value of the ripple voltage $u_{\rm PP-ripple}$, the ripple frequency $f_{\rm Ripple}$, the average value of the rectified voltage $|ū_{\rm R}|$ and the peak value of the rectified voltage $u_{\rm R,~max}$. Enter the results in the second free line of <tabref Table-2-Bridge-Rectifier_V3>.