31. Alternating Current

Which of the following devices is most likely to operate on alternating current ($\mathrm{AC}$)?

In the context of alternating voltages and currents, which of the following best describes the frequency of an alternating current?

Which of the following is a primary advantage of using $AC$ power over $DC$ power for large-scale electrical distribution?

What is the standard frequency of alternating current ($\mathrm{AC}$) supplied to households in the United States of America?

An AC source produces an alternating current in a circuit with the function $i\left(t\right)=\left(1.5A\right)\cos\left\lbrack\left(250s^{-1}\right)t\right\rbrack$. What is the frequency of the source? What is the maximum current in the circuit?

The current in an AC circuit takes 0.02 s to change direction. What is the angular frequency of the AC source?