Given Vs = 81 volts at zero phaseR = 22 ohmsL = 3.7 mHC = 0.6 microfaradsFrequency, F= 1000 HzCalculate the phase of the phasor current I in radians.Choose a value of phase between -pi and +pi
Question
Given Vs = 81 volts at zero phaseR = 22 ohmsL = 3.7 mHC = 0.6 microfaradsFrequency, F= 1000 HzCalculate the phase of the phasor current I in radians.Choose a value of phase between -pi and +pi
Solution
Given Vs = 81 volts at zero phase
R = 22 ohms
L = 3.7 mH
C = 0.6 microfarads
Frequency, F= 1000 Hz
Calculate the phase of the phasor current I in radians.
Choose a value of phase between -pi and +pi.
The phase of the phasor current can be calculated using the formula:
θ = arctan((Xl - Xc) / R)
where Xl is the inductive reactance, Xc is the capacitive reactance, and R is the resistance.
The inductive reactance (Xl) is given by:
Xl = 2πFL
The capacitive reactance (Xc) is given by:
Xc = 1 / (2πFC)
Let's calculate the inductive reactance:
Xl = 2π * 1000 * 3.7 * 10^-3 = 7.34 ohms
Now, let's calculate the capacitive reactance:
Xc = 1 / (2π * 1000 * 0.6 * 10^-6) = 265.26 ohms
Now, let's calculate the phase:
θ = arctan((7.34 - 265.26) / 22) = arctan(-11.72)
The arctan function returns a value in the range -pi/2 to pi/2. Since the argument is negative, the phase is in the second or third quadrant. Because the current lags the voltage in a series RLC circuit, the phase is in the second quadrant.
Therefore, the phase of the phasor current (I) is approximately -1.41 radians.
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