Ac

Question 1

Equation of Ac current

Answer 1

I = Im (sin wt + psi)

Question 2

Current or voltage average over half cycle

Answer 2

avg = (2/pi)max

Question 3

average value of ac over complete cycle is

Answer 3

0

Question 4

rms value of current or voltage?

Answer 4

max/root 2 or 0.707 max

Question 5

form factor =

Answer 5

rms/avg

Question 6

Crest or peak factor =

Answer 6

max/rms

Question 7

inductive reactance, XL =

Answer 7

wL

Question 8

Capacitive reactance, Xc =

Answer 8

1/wC

Question 9

current lags or leads in inductor

Answer 9

in inductor, current lags

Question 10

current lags or leads in capactor

Answer 10

the c in capacitor is current so it leads

Question 11

impedance =

Answer 11

whole root of (R^2 + (XL-Xc)^2)

Question 12

phase difference in lcr circuit psi, =

Answer 12

(XL-Xc)/R

Question 13

at resonance, value of w is w0, which is equal to =

Answer 13

1/rootLC

Question 14

quality factor formula

Answer 14

Xc or XL/R

Question 15

Susceptance =

Answer 15

1/X

Question 16

Admittance =

Answer 16

1/Z

Question 17

for transformer, ep/es =

Answer 17

Np/Ns

Question 18

for transformer, efficiency =

Answer 18

es Is/ ep Ip

Question 19

for ac generator, max emf =

Answer 19

BAwN

Question 20

Average power

Answer 20

Pavg = Irms Vrms costheta

Question 21

Wattless current

Answer 21

Irms sin theta