{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ch21notes

# ch21notes - SI unit henry(H IMPEDANCE Z RESISTANCE R...

This preview shows pages 1–2. Sign up to view the full content.

Chapter 21 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Basic AC Circuits INPUT ac voltage E ( t ) = E m sin ωt OUTPUT ac current i ( t ) = I m sin ( ωt φ ) E ( t ) E m 0 t T 2 T E m How does the current compare with the driving voltage (emf)? Peak is reduced by Ohm’s Law for ac circuits: I = E / Z Waveform is shifted by a phase angle φ : –90° φ ≤ +90° Root-Mean-Square Value a type of average related to standard deviation 2 peak rms Ohm’s Law: V rms = I rms Z or V m = I m Z Power Law: P av = I 2 rms R or P av = ½ I 2 m R Components of Basic AC Circuits : 1) Resistors – cause heat to dissipate but do not introduce a phase shift 2) Capacitors – store charge, impede low frequencies, adds (–) phase shift 3) Inductors – store current, impede high frequencies, add (+) phase shift Inductors are coils, rated by their inductance L

This preview has intentionally blurred sections. Sign up to view the full version.

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

Unformatted text preview: , SI unit: henry (H) IMPEDANCE Z RESISTANCE R REACTANCE X CAPACITIVE X C INDUCTIVE X L C X C 1 L X L f 2 Ohm’s Law: V R = IR V C = IX C V L = IX L Chapter 21 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Phase Diagram : X L +90° R 0° X C –90° Resonance phenomenon found in a variety of physical systems discuss pumping legs on swing, cracking glass with sound, musical instruments, Tacoma Narrows Bridge in Wash. What happens when the driving frequency equals ω ? Maximum current Minimum total impedance Current in phase with driving voltage Maximum power transferred from source to circuit X L = X C LC 1...
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