1 Signal and System 1.1.2 Signal Energy and Power A. Energy (Continuous-time Instantaneous power p(t)=v()()=v2(t)=Rt2(t) R Let r=1Q. so p()=i2(t)=v2(t)=x2(t)1 Signal and System 1.1.2 Signal Energy and Power A. Energy (Continuous-time) Instantaneous power: ( ) ( ) 1 ( ) ( ) ( ) 2 2 v t R i t R p t = v t i t = =  Let R=1Ω, so p(t)=i2 (t)=v2 (t)=x2 (t)