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23 Nov 2019

A battery is used to drive a circuit. After acerain amount of time , the current is zero amperes. When the samecircuit is driven by an ac generator, the current is non-zero andalternates. What element(s) (resistors, capacitors, inductors) inthe circuits is/are responsiblefor this effect? Why?

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Collen Von
Collen VonLv2
29 May 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

find the amplitude of the current i0 through the voltage source.

To understand the use of phasors in analyzing a parallel AC circuit.Phasor diagrams, or simply phasors, provide a convenient graphical way of representing the quantities that change with time along with  .This makes them useful for analyzing AC circuits with their inherent phase shifts between voltage and current. If a quantity I(t) changes with time as   , a phasor is a vector whose length represents the amplitude Io(see the diagram). This vector is assumed to rotate counterclockwise with angular speed  ; that way, the horizontal component of the vector represents the actual value I(t) at any given moment.In this problem, you will use the phasor approach to analyze an AC circuit.

In answering the questions of this problem, keep the following in mind.

For a resistor, the current and the voltage are always in phase.

For an inductor, the current lags the voltage by .

For a capacitor, the current leads the voltage by .

MasteringPhysics: Problem Print View

Part A
Phasors are helpful in determining the values of current and voltage in complex AC circuits.
Consider this phasor diagram:
The diagram describes a circuit that contains two elements connected in parallel to an AC source. The vector labeled corresponds to the voltage across both elements of the circuit. Based on the diagram, what elements can the circuit contain?
1) two resistors
2) two inductors
3) two capacitors
4) a capacitor and a resistor
5) an inductor and a resistor
6) a capacitor and an inductor
 
Part B
Find the amplitude   of the current through the voltage source.
Express your answer in terms of the magnitudes of the individual currents  
 
Consider a circuit of four elements that are connected inseries. Two elements are resistors with a resistance of 100 ohmseach. The other two elements are capacitors of 10 micro faradayeach. The whole circuit is connect to a 12 V battery. The batteryis connected parallel to the two capacitors and makes thecapacitors charged fully. The battery is disconnected suddenly.After what time does the charge drops to half of its initial value.What is the current in a resistor at this moment?

True or false, and why?

1. A circuit that includes resistors, capacitors, and inductancesin parallel is called an RLC circuit.

2. When capacitors and inductances are introduced into a DCcircuit, we get an AC circuit.

3. When an inductance is connected to a DC power source, thecurrent flowing through it decreases exponentially with time.

4. As a capacitor charges, the voltage across decreases.

5. The rms-current in an RL-circuit is the peak current divided bythe reactance.

6. In an RL-circuit, the current and the voltage are inphase.

7. The higher the frequency of the AC voltage source in anRL-circuit, the higher the currents.

8. In a circuit with an AC power source and an inductance inseries, the inductive reactance takes the place of the resistance.

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