(a) In an RLC series circuit as shown in Figure 2, R = 40 Q, L= 1 H, C = 16 x 10* F, and the voltage source is E (t) = 100 cos 10t V. Determine the current i(t) in the circuit using the undetermined coefficients if at the initial ume i(0) = 0, and q (0) = 0 C.
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- Calculate the resonant angular freqency of an RLC series circuit for which R=20 , L=75mH, and C=4.0F , (b) If R is changed to 300, what happens to the resonant angular frequency?Can the instantaneous power output of an ac source ever be negative? Can the average power output be negative?Check Your Understanding What happens to the resonant frequency of an RLC series circuit when the following quantities are increased by a factor of 4: (a) the capacitance, (b) the self-inductance, and (c) the resistance?
- An ac source of voltage amplitude 100 V and variable frequency f drives an RLC series circuit with R=10 , L = 2.0 mH, and C=25F (a) Plot the canal through the resistor as a function of the frequency f. (b) Use the plot to determine the resonant frequency of the circuit.Calculate the rms currents for an ac source is given by v(t)=v0sint , where V0=100V and =200rad/s when connected across (a) a 20F capacitor, (b) a 20-mH inductor, and (c) a 50 resistor.Check Your Understanding Show that the tins voltages across a resistor, a capacitor, and an inductor in an ac circuit where the tins current is Irmsare given by IrmsR,IrmsXC , and IrmsXL, respectively. Determine these values for the components of the RLC circuit of Equation 15.12. Pave=12t0v0cos (15.12)
- Check Your Understanding The resonant angular frequency of an RLC series circuit is 4.0102 rad/s. An ac source operating at this frequency transfers an average power of 2.0102W to the circuit. The resistance of the circuit Is 0.50 Q. Write an expression for the emf of the source.Check Your Understanding Repeat Example 15.1 for an ac source of amplitude 20 V and frequency 100 Hz.Explain why at high frequencies a capacitor acts as an ac short, whereas an inductor acts as an open circuit.
- At s1iat frequency is the reactance of a 20F capacitor equal to that of a 10-mH inductor?In an L-R-C series circuit, suppose R = 300 ohms, L = 60 mH, C = 0.50 uF, V = 50 V, and w = 10,000 rad/s. Find 4) the phase angle φ, and 5) the voltage amplitude across each circuit element (inductor, resistor, capacitor).An RLC series circuit has a voltage source given by E(t)=20 V, a resistor of 150 Ω, an inductor of 6 H, and a capacitor of 0.05 F. If the initial current is zero and the initial charge on the capacitor is 4 C, determine the current in the circuit for t>0. I(t)=?