The voltage across and current through a device are given by:
i(t) = 0.1cos(4∏t)A
determine the instantaneous power p(t) at t=0 and t = 0.25s
The Attempt at a Solution
for t=0 I got p=0.5W
for t=0.25 I got p = 0.5W
the textbook says at t=0 it should be 0. Does power always equal 0 at t=0 or did i mess up on my calculation?