6. Which of the following phrases best describes the term impedance? a. the resi
ID: 2036372 • Letter: 6
Question
6. Which of the following phrases best describes the term impedance? a. the resistance to the movement of charge carriers b. the resistance of a capacitor c. the resistance of an inductor d. the internal resistance of a battery within an LRC circuit e. the generalized expression that combines all resistances within a circuit 7. Four circuits are set up so that each contains an ac source and an Hz source and a 15-il inductor. Circuit B has a 60-Hz source and a 10-?? inductor. Circuit C has a 100-Hz source and a 2-uH inductor. Circuit D has a 50-Hz source and a 4-ulH inductor. Rank the inductive reactance for these circuits in order, from largest to smallest inductor. Circuit A has a 50- a. A> B>C>D b. A>B>C-D c. A-B>D>C 8. The graph shows the current as a function of time for an electrical device plugged into an outlet with an rms voltage of 120 V. What is the resistance of the device? a. 24 ? b. 21 2 c. 17? d. 14? ?. 12 0.005 0010 005 0020 0.25 0030 0035 0.040 0 045 00s Time (s) 9. Which of the schematic symbols below is used for an inductor? a. 0202 c. It d. e.Explanation / Answer
6.
Correct option is D.
Impedance = Z = sqrt (R^2 + (XL - XC)^2)
7.
Inductive Reactance is given by:
XL = w*L = 2*pi*f*L
(A) XL = 2*pi*50*15*10^-6 = 4.71*10^-3
(B) XL = 2*pi*60*10*10^-6 = 3.77*10^-3
(C) XL = 2*pi*100*2*10^-6 = 1.26*10^-3
(D) XL = 2*pi*50*4*10^-6 = 1.26*10^-3
Correct order is
A > B > C = D
Correct option is B.
8.
Vrms = 120 V
Vmax = Vrms*sqrt 2 = 120*sqrt 2 = 169.7 V
From the graph
imax = 10 A
So, R = Vmax/imax = 169.7/10 = 16.97 = 17 ohm
Correct option is C
9.
Correct option is A.
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