Check Your Understanding
Conceptual Questions
The instantaneous power is the power at a given instant. The average power is the power averaged over a cycle or number of cycles.
The adapter has a step-down transformer to have a lower voltage and possibly higher current at which the device can operate.
Problems
The reactance of the capacitor is larger than the reactance of the inductor because the current leads the voltage. The power usage is 30 W.
Additional Problems
Challenge Problems
a. 335 MV; b. the result is way too high, well beyond the breakdown voltage of air over reasonable distances; c. the input voltage is too high
The units as written for inductive reactance Equation 15.8 are . Radians can be ignored in unit analysis. The Henry can be defined as . Combining these together results in a unit of for reactance.