Physics - Capacitor Question with Solution | TestHub

The electric heater, whose schematic is shown in Fig., operates as follows :

The switch first moves to position 1, and the capacitor with capacitance $C$ charges completely to the electromotive voltage of the source $U_e$. Then, the switch moves to position 2, and the capacitor fully discharges through the heating element of the heater, which has resistance $R$. This process repeats with frequency $f$. The source has an internal resistance $R_i$. Take $C=100\mu \mathrm{F}$, $R=20\Omega$, $U_e=90\mathrm{V}$, $R_i=80\Omega$, $f=2{\mathrm{s}}^{-1}$.