Find the power delivered to an element at t=3 ms if the current entering its positive terminal is i=5cos60πt A and the voltage is V=3 di/dt

Answer 1

power=vi=5cos60PI t *(-60*PI*5*PIsin60PIt)
at t=.003
Power=-300*5cos(60PI*.003)sin(60PI*.003)=

= -2132watts
check the math.