b) 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
(i) v = 3i
(ii) v = 3di/dt
"P=iv,"
a)
"v=15\\cos60\\pi t,"
"P=75\\cos^260\\pi t,"
"P(3)=75~W,"
b)
"v=-900\\pi \\sin 60\\pi t,"
"P=-2250\\pi \\sin 120\\pi t,"
"P(3)=0."
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