A transistor is used as a switch and the waveforms are shown below. The parameters are given as follows: $V_{CC}=200V,V_{BE(\text{s}\text{a}\text{t})}=2\mathrm{.}3V,I_{BS}=8A,V_{CE(sat)}=2\mathrm{.}5V,I_{CS}=120A,t_d=0\mathrm{.}1s,t_r=0\mathrm{.}45s,t_s=3\mathrm{.}2s,t_f=1\mathrm{.}1s,t_n=49\mathrm{.}45s,t_0=45\mathrm{.}7s$ and $f_s=10KHz,k=50\%$ and $I_{\text{C}\text{E}\text{O}}=3mA.$

The average losses during the rise time $t_r=$ w