Exam 32: Alternating Current Circuits

The time-averaged value of $\cos ^ { 2 } \omega t$ is

In an ideal capacitor

An ideal resistor has no capacitance or inductance; therefore in an RLC series circuit, the current through the resistor

The law used to relate the voltage drops in a circuit containing a resistor, a capacitor, an inductor, and an AC source is

We can check the answer to the previous question by remembering that the LC system is analogous to a mass-spring system whose natural frequency is (k/m) $1 / 2$ . The correct analogy is

The angle $\theta$ is the phase angle between

Consider an ideal capacitor C connected directly to an AC voltage source V. Summing voltage drops around the loop yields

The time-averaged power dissipated in a resistor is obtained by using

If the resistance for a simple series RLC circuit is increased, the resonant frequency of that circuit (provided it still readily oscillates)

If the current is stepped up in a transformer, the

The natural frequency for an LC circuit is

All of the following have the same dimensions except

The appropriate phasor diagrams for the elements of a simple series RLC circuit and a simple parallel RLC circuit represent, respectively,

The quality factor ("Q") of a simple series RLC circuit is increased when each of the following elements is independently decreased except

For ideal elements, energy can be dissipated in

The impedance (Z) of an RLC circuit with 15 $\Omega$ resistor, 7 $\Omega$ capacitive reactance, and 12 $\Omega$ inductive reactance is

A particular transformer has a greater number of turns on the secondary winding than on the primary winding. This transformer is called

A way to check your response to the previous question is to remember that for elements in series

Given the fact that a real inductor is composed of real wire, we can predict that the phase angle between the voltage across it and the current through it will be

In the transfer of electrical energy over power lines, it is desirable to minimize Joule heating by increasing the operating voltage. What prevents the energy company from stepping up the voltage to an extremely high level?