Here is the problem:
The assignment asks to calculate various voltages and currents in this circuit.
Here is my thought process and what I tried:
The capacitor is per assignment fully charged, so I think no current should flow there.
Also the diode has an ideal current-voltage characteristic where it lets through any current if the voltage is above \$0.7 V\$
\$I_2\$ is per my best knowledge \$I_2=0A\$ since the capacitor is fully charged and no more current can flow into it.
\$I_1\$ is the current flowing through \$R_1\$ which should be easy to calculate: \$I_1 = 3.5 V :280 \Omega = 0.0125 A \$
\$ U_1 \$ should also be \$3.5 V\$ since there is nothing lowering the voltage, am I right in my assumption ?
Also I think the only part of this circuit where the voltage gets changed is after the diode at \$U_3\$ and/or \$U_4\$ because of Kirchhoffs circuit laws.
Here is my problem:
I don't know how to "resolve" the diode in parallel with the resistor, since our voltage across the whole circuit is \$3.5 V\$ I don't think any current is going to flow through \$R_4\$, because why would the current go the resistor when the diode is "faster", but per Kirchhoff's circuit laws both voltages should be equal, right ?
I don't know how to calculate: \$I_5\$, since I don't know how to treat \$R_4\$.
Also, I don't even have an approach on how to calculate \$I_0\$ since I don't how to calculate the \$R_4+R_1\$ resistance, to clarify, I don't know if that is the correct way.