{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

AC Circuits

# T i t i max cos t power is calculated as before

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: voltage across R is also going to zero. In other words, the current and voltage in different parts of the circuit is not “in sync.” Another word for this is “out of phase.” For a capacitor, the mathematical relationships are more complicated because of the out ­of ­phase behavior of V and I: V (t ) = Vmax sin ! t I (t ) = I max cos ! t Power is calculated as before: P(t ) = Vmax I max sin ! t cos ! t Note that the average voltage and the average current are both zero as for the pure resistor circuit; however, the average power also happens to be zero. The average power in a capacitor is zero because while it stores up energy during charging, it then releases it during discharging. There are similar relationships for circuits that include inductors. Impedance It is difficult to express some form of Ohm’s Law as a function of time in terms of voltages and...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern