A charge of 0.1 C passes through an electric source of 6 V from its negative to its positive terminals. Find the change in energy received by the charge. Comment on whether the charge has gained or lost energy, and also on the sign to be assigned to the change of energy.
The voltage at terminal a relative to terminal b of an electric component is v(t) = 20 cos 120πt V. A current i(t) = −4 sin 120πt A flows into terminal a. From time t1 to t2, determine the total energy flowing into the component. In particular, find the energy absorbed when t2 = t1 + 1/15.
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