Chapter 14, Problem 29P

If the current through and voltage across an element are $i=8{\text{ sin (wt+40}}^{\circ }\text{) and }v=48{\text{ sin, (wt+40}}^{\circ }),$ respectively, compute the power by I² R, $\left(V_m{I}_m/2\right)\text{ cos}\theta ,$ and $VI\cos \theta$ and compare answers.