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College Physics
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ISBN: 9781305952300
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Publisher: Cengage Learning
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A 25-μF capacitor is connected to an emf given by v(t) = (160 V) sin (120πt) . (a) What is the reactance of the capacitor? (b)Write an expression for the current output of the source.
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- A current of I(t) = (5.50 mA)((sin(325 s-1)t ) passes through a 38 microF capacitor. What is the rms voltage across the capacitor?arrow_forwardAn alternating emf source with a variable frequency fa is connected in series with a 43.02 resistor and a 19.0 μF capacitor. The emf amplitude is 11.0 V. Consider a phasor diagram for phasor VR (the potential across the resistor) and phasor Vc (the potential across the capacitor). (a) At what driving frequency fa do the two phasors have the same length? At that driving frequency, what are (b) the phase angle in degrees, (c) the angular speed at which the phasors rotate, and (d) the current amplitude? (a) Number i 216.4 (b) Number i 45 (c) Number i 1361.6 (d) Number i 158 Units Units Units Units Hz (degrees) rad/s mAarrow_forwardA 2.04 kN resistor is connected to an AC voltage source with an rms voltage of 230 V. HINT (a) What is the maximum potential difference across the resistor (in V)? V (b) What is the maximum current through the resistor (in A)? A (c) What is the rms current through the resistor (in A)? A (d) What is the average power dissipated by the resistor (in W)?arrow_forward
- A sound speaker is rated at a voltage of P = 120.0 V and a current of Iurrenmt = 8.00 A Electrical power consumption is P = IV , where the units are: [W] = [A] [V] . To test the speaker, a signal of a sine wave is applied to the speaker. Assuming that the sound wave moves as a spherical wave and that all of the energy applied to the speaker is converted to sound energy, how far from the speaker is the intensity equal to I = 3.73 W/m ? Express your answer in m. Hint: remember, the intensity of a wave is I =arrow_forward1. b) Write down the second order ordinary differential equation that represents the electric circuit. Where R = 302, C=1/7 F, L = 4 H, and the voltage source E(t) = 110 Sin377t DO NOT SOLVE THE SYSTEM FOR CURRENT. R www C E(t) = Esin ot еееarrow_forwardTwo capacitors with C1 = 200 μF and C2 = 850 μF are connected in series. What is the reactance of the equivalent capacitance at 320 Hz?arrow_forward
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