#### v9260019

##### Member level 2

p(t)=v(t)i(t)=v(t)Cpv(t)=p[1/2*Cv(t)^2]=pw(t)

Look at the last two terms and apply the 1/p operator from the left. Then ,assuming that w(t) is zero for t<=0 along with voltage and current, we have

w(t)=1/2*Cv(t)^2

"Then ,assuming that w(t) is zero for t<=0 along with voltage and current"

why need this assumption ????