COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 25QAP
To determine
The voltage leads the current
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Consider an AC circuit consisting of an AC voltage source, a 30-W resistor, a 450-mF capacitor, and a 0.35 H inductor in series. A current given by 20 mA cos(127 rad/s * t) flows through the circuit.What is the voltage across the capacitor as a function of time? What is the voltage across the inductor as a function of time? What is the voltage across the AC voltage source as a function of time, written as a single term? How much energy is dissipated in the resistor in one minute?
A circuit consists of a light bulb, a capacitor, and an inductor connected in series to an ac source. What happens to the brightness of the bulb when the inductor is omitted? When the inductor is left in the circuit but the capacitor is omitted? Explain.
A capacitor of capacitance C is connected to an ac generator. What effect does increasing the capacitance have on the reactance and
current in this circuit?
Reactance
Current
increases
increases
increases
decreases
decreases
increases
no change
no change
decreases
no change
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
Ch. 21 - Prob. 11QAPCh. 21 - Prob. 12QAPCh. 21 - Prob. 13QAPCh. 21 - Prob. 14QAPCh. 21 - Prob. 15QAPCh. 21 - Prob. 16QAPCh. 21 - Prob. 17QAPCh. 21 - Prob. 18QAPCh. 21 - Prob. 19QAPCh. 21 - Prob. 20QAPCh. 21 - Prob. 21QAPCh. 21 - Prob. 22QAPCh. 21 - Prob. 23QAPCh. 21 - Prob. 24QAPCh. 21 - Prob. 25QAPCh. 21 - Prob. 26QAPCh. 21 - Prob. 27QAPCh. 21 - Prob. 28QAPCh. 21 - Prob. 29QAPCh. 21 - Prob. 30QAPCh. 21 - Prob. 31QAPCh. 21 - Prob. 32QAPCh. 21 - Prob. 33QAPCh. 21 - Prob. 34QAPCh. 21 - Prob. 35QAPCh. 21 - Prob. 36QAPCh. 21 - Prob. 37QAPCh. 21 - Prob. 38QAPCh. 21 - Prob. 39QAPCh. 21 - Prob. 40QAPCh. 21 - Prob. 41QAPCh. 21 - Prob. 42QAPCh. 21 - Prob. 43QAPCh. 21 - Prob. 44QAPCh. 21 - Prob. 45QAPCh. 21 - Prob. 46QAPCh. 21 - Prob. 47QAPCh. 21 - Prob. 48QAPCh. 21 - Prob. 49QAPCh. 21 - Prob. 50QAPCh. 21 - Prob. 51QAPCh. 21 - Prob. 52QAPCh. 21 - Prob. 53QAPCh. 21 - Prob. 54QAPCh. 21 - Prob. 55QAPCh. 21 - Prob. 56QAPCh. 21 - Prob. 57QAPCh. 21 - Prob. 58QAPCh. 21 - Prob. 59QAPCh. 21 - Prob. 60QAPCh. 21 - Prob. 61QAPCh. 21 - Prob. 62QAPCh. 21 - Prob. 63QAPCh. 21 - Prob. 64QAPCh. 21 - Prob. 65QAPCh. 21 - Prob. 66QAPCh. 21 - Prob. 67QAPCh. 21 - Prob. 68QAPCh. 21 - Prob. 69QAPCh. 21 - Prob. 70QAPCh. 21 - Prob. 71QAPCh. 21 - Prob. 72QAPCh. 21 - Prob. 73QAPCh. 21 - Prob. 74QAPCh. 21 - Prob. 75QAPCh. 21 - Prob. 76QAPCh. 21 - Prob. 77QAPCh. 21 - Prob. 78QAPCh. 21 - Prob. 79QAPCh. 21 - Prob. 80QAPCh. 21 - Prob. 81QAPCh. 21 - Prob. 82QAPCh. 21 - Prob. 83QAPCh. 21 - Prob. 84QAPCh. 21 - Prob. 85QAP
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- A circuit contains a light bulb and a capacitor (RC circuit) in series connected to an AC power supply. How should you choose the AC frequency such that the light glow the brightest? Why?arrow_forwardAn AC series circuit contains a resistor of 20 W, a capacitor of 0.75 mF and an inductor of 120 mH. What frequency should be used to create a resonance condition in the circuit? 160 Hz 320 Hz 640 Hz 530 Hzarrow_forwardWhen the frequency of an ac circuit is increased at constant voltage, the current increases and then decreases. Which combination of elements is most likely to comprise this circuit? capacitors only resistors only inductors only a combination of inductors and resistors a combination of inductors and capacitorsarrow_forward
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- A capacitor is connected to an AC generator. As the generator’s frequency is increased, the current in the capacitorA. Increases.B. Decreases.C. Does not change.arrow_forwardA resistor, an inductor, and a capacitor are connected in series to an AC source. What is the condition for resonance to occur?arrow_forwardThe voltage and current through a capacitor connected to an ac generator are shown (super-imposed) in the graph below. Note the time for 1.75 cycles is given as 0.14 s. 99 V 0.14 s 2.8 A 0 AAA What is the rms current through the capacitor? 1.98 A 3.53 A 2.56 A 1.25 A 1.74 Aarrow_forward
- In an AC circuit, the effective impedance of the series combination of an inductor and a capacitor: O does not depend on the frequency O is zero at all frequencies is zero at the resonance frequency of the circuit O is zero at all frequencies except the resonance frequency of the circuitarrow_forwardThe following graph shows the voltage and current through a single circuit element where V-73.0VI-2.20.4,-0.0249 s. voltage 生 pument: %23 23 %23 %23 樂 耕 %23 世 What is the frequency of the ac generator? b) What is the average power dissipated in this element? c) The circuit element above is either a resistor, an inductor, or a capacitor. Use the graph and what you know of circuit clements to determine what type of element is shown in the graph. If it is a resistor, what is the value of its resistance? If it is an inductor, what is its inductance? If it is a capacitor, what is its capacitance?arrow_forwardWhat is the impedance of a RLC circuit with a resistor of 120 ohms, and an inductor of 48 mH and a capacitor of 309 nF when the AC source is operating at f= 791 Hz Z= 615 ohms Z= 429 ohms O Z= 182 ohms O Z= 198 ohms O Z= 562 ohmsarrow_forward
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