Question
A certain electrical element draws the current $i(t)=10 \cos 4 t \mathrm{A}$ at a voltage $v(t)=120 \cos 4 t \mathrm{V}$ Find the energy absorbed by the element in 2 s.
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In this case, the power is given by $p(t) = v(t) \cdot i(t)$. Show more…
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