Question

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We have a series RLC circuit with an AC voltage source: The resistance is 100Ohm, the inductance is 10mH, the capacitance is 10mF. Select all the right answers.

At 60Hz the total impedance is

Question 13 options:

	less than 100Ohm
	Is more than 100Ohm
	Is within 1% of 100 Ohm
	Is not within 1% of 100Ohm

Question 14 (1 point)

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We have a series RLC circuit with an AC voltage source: The resistance is 100Ohm, the inductance is 10mH, the capacitance is 10mF. Select all the right answers.

At 60Hz

Question 14 options:

	The absolute phase difference between the current and the voltage at the source is less than 4 degree
	The absolute phase difference between the current and the voltage at the source is less than 2 degrees
	The absolute phase difference between the current and the voltage at the source is less than 6 degrees
	The absolute phase difference between the current and the voltage at the source is less than 3 degrees
	The absolute phase difference between the current and the voltage at the source is less than 5 degrees
	The absolute phase difference between the current and the voltage at the source is less than 1 degree

Question 15 (1 point)

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We have a series RLC circuit with an AC voltage source: The resistance is 100Ohm, the inductance is 10mH, the capacitance is 10mF. Select all the right answers.

At 60Hz what is true?

Question 15 options:

	The voltage across the inductor and capacitor lags behind the voltage across the resistor
	The voltage across the inductor lags behind the current.
	The voltage across the capacitor and resistor lags behind the current
	The voltage across the resistor lags behind the voltage across the inductor

Answer 1

13.

Answer is Is B)more than 100Ohm

Inductive reactance

X_L=2pifL =2pi*60*10*10^-3 = 3.77 ohms

Capacitive reactance

X_C =1/2pifC=1/2pi*60*10*10^-3 = 0.265 ohms

Impedance

Z=sqrt[R²+(X_L-X_C)²] =sqrt[100²+(3.77-0.265)²]

Z=100.06 ohms

14)

Answer is D)The absolute phase difference between the current and the voltage at the source is less than 3 degrees

Phase angle

o=tan^-1(X_L-X_C/R) =tan^-1[(3.77-0.265)/100]

o=2^o

15.

Answer is

The voltage across the inductor and capacitor lags behind the voltage across the resistor