I'm trying to find an expression for the current through the resistor \$R\$ when the AC-source is at max voltage of 5 volts.
\$U_T\$ represents the voltage drop across each diode.
\$R_D\$ represents the the internal resistance of each diode.
As you can see on the picture, I'm wondering how the expression for the current \$I\$ through the resistor is derived?
Now I got the wrong answer if I said that after all the voltage drops the voltage is zero, therefore I'm trying to understand how the formula on the picture has been derived.