Chapter 24 Flashcards Preview

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Flashcards in Chapter 24 Deck (11):
1

Phasors: Resistor

V in phase with I

2

Phasors: Capacitor

V lags behind I by 90 degrees

3

Voltage across R is ALWAYS (in phase/ out of phase) with current through R

In phase

4

Phasor facts

- vectors whose length is the maximum of V or I
- rotate around an origin with the angular speed of the oscillating current

5

The instantaneous value of V or I...

The projection of the phasor on the y axis

6

Phasors: Inductor

V leads I by 90 degrees

7

Define: phasor

A vector whose magnitude is the maximum value of a quantity and which rotates counterclockwise in a 2-d plane with angular velocity w

8

Presistor/avg =

= Isqrms R

9

Loop equation (capacitor)

VsubC = Q/C = €subm sinwt

>>> Q = C €subm sinwt

>>> IsubC = [dC/dt] = wC€subm coswt

10

Voltage across C lags current through C by...

One-quarter cycle (90degrees)

11

How is the rms current in the capacitor related to its capacitance and to the frequency?

Irms = wCVrms