Question

3, A series RCL circuit contains a 222-Ω resistor, a 1.40-μF capacitor, and a 0.125-H inductor. The 360-Hz ac generator in the circuit has an rms voltage of 208 V. What is the average electric power dissipated by the circuit? A) 22 W B) 81 W C) 166 W D) 191 w E) 102 w 4. An oscillating LC circuit has a resonant frequency of 1.2 × 106 Hz. The diagram shows the system att-0s when there is no charge on the capacitor and the current is in the direction shown. At this time, the energy stored in the inductor is 2.5 × 10.1 4a. Determine the numerical value of the capacitance. A) 2.4× 10-1, F B) 3.6× 10-11F d) 4.4 × 10-11 F D) 68 x 10-1l F E) 8.8× 10-11 F し 0.20 ml 4b. Determine the value of the current at the instant shown in the drawing. A) 0.02 A B) 0.03 A C) 0.05 A D) 0.09 A E) 0.12 A 5. Complete the following statement: The main difference between an npn transistor and a pnp transistor is that A) the bias voltages are reversed. B) they are made from different materials C) one is a bipolar transistor and the other is not. D) one conducts electricity and the other does not. E) the current directions are the same while the voltages are reversed.

Answer 1

R = 222 ohm, C = 1.40 muf, l = 0.125 H f = 360 Hz X_C = 1/2 pi f c = 1/2 pi (360) (1.4 times 10^-6) = 315.78 ohm X_L = 2 pi f_L = 2pi (360) (0.125) = 282.74 ohm therefore Independence z = squareroot R^2 + (X_c - X_L)^2 = 224.44 ohm therefore P = v^2/2 = 208^2/224.44 = 191 w option (D)