The buck converter with resistive load has the input voltage of 30[V], the output voltage of 20 [V] (constant), and the switching frequency of 30 [kHz]. If the output average power is 20[W], then determine the size of the inductor such that the minimum inductor current is 25 % of the average inductor current.

A resistor of 20ohms and a capacitance of unknown value when connected. In in parallel across a 100V, 50Hz supply take a current of 6A. The combination is now connected across a 100V supply of unknown frequency and the current  falls to 5.5A . What is the frequency?

In the diagram below, the switch S has been closed for a long time. A) What is the output voltage Vout? What is the charge on the capacitor? b) The switch is opened, so the output voltage increases. What is the time constant that describes the charging of the capacitor in terms of R and C? c) When Vout reaches 10 V, the switch closes and the capacitor begins to discharge. What is the time constant that describes the discharging in terms of R and C? Hint: Apply Kirchhoff's Rules to both loops and the sum of the currents at the junction above the capacitor in the diagram, and use I=dq/dt. If the switch opens when Vout reaches a lower value, say 5V, the capacitor will charge again, and thus one can cycle the voltage with a time constant determined by the circuit: this demonstrates the principle of operation of an electronic timer. 4R S 15 V Vout R

double clipper circuit  Zener diodes 1N4733A has a voltage of 5.1 V and 1N4735A has a voltage of 6.2 V with a resistor R=300ohms has been used. you may like to increase the input to a 12 VRMS AC source in order to see the clipping at 7volt. Please, Do the theoretical calculations and plot the expected waveforms by hand. ( I have its multisim design and only needs theoretical calculation and hand drawn graph of it to compare to its data that I have collected  from multism.) Thanks

Please asap

Please do D, E, and F