Questions and Answers
A pure capacitive circuit is theoretical because it involves no resistance.
True
Adding capacitance to an AC series circuit increases the circuit current.
False
In a simple series circuit, current is the reference point.
True
In a capacitor, consumed power has a positive value, while power returned to a circuit is negative.
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Frequency does not affect capacitive reactance.
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Angle theta is the angle by which current leads the source voltage.
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As capacitive reactance increases, circuit impedance increases.
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Resistive current is in phase with source voltage in a parallel resistive-capacitive circuit.
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The Pythagorean theorem can be used to calculate the source current in a parallel resistive-capacitive circuit.
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Series/parallel resistive-capacitive circuits should not be used for electronics applications.
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Power in a pure capacitive circuit is the equivalent of reactive power in a capacitive circuit.
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In a pure capacitive circuit, the capacitor uses energy to charge, and half of this energy is returned to the circuit when the capacitor discharges.
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In a series resistive-capacitive circuit, impedance is the combination of inductance and capacitive reactance to oppose the flow of voltage.
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In an inductive-resistive circuit, apparent power is lagging, indicating inductance.
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A change in impedance also causes a change in capacitive reactance.
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Capacitive reactance is inversely proportional to frequency (in Hz) and capacitance (in F).
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When the values of circuit resistance and capacitive reactance are known, total impedance in a series resistive-capacitive circuit can be calculated by using Ohm's law.
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Parallel resistive-capacitive circuits are used in electronic AC applications such as computers, CD-ROM players, DVD players, DVR equipment, amplifiers, stereo receivers, oscilloscopes, and video production equipment.
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When the reactive and resistive values of components are given, impedance in a parallel resistive-capacitive circuit can be calculated by using the vector diagram method.
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Changes in circuit parameters in both series and parallel resistive-capacitive circuits vary with an increase or decrease in frequency or capacitance.
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________ reactance is the opposition to current flow by a capacitor.
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Capacitive reactance is measured in _________.
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_________ in a series resistive-capacitive circuit is the same at all points for all components and devices.
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In a parallel resistive-capacitive circuit, frequency has no effect on source voltage or ________.
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In a series/parallel resistive-capacitive circuit, ______ is used as the reference point for the series components.
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In a pure capacitive circuit, current leads the source voltage by ______ degrees.
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In a series/parallel resistive-capacitive circuit, _______ is used as the reference point for the parallel branches.
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If angle theta is known, the ___ function can be used to calculate the value of the source voltage.
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When the values of source voltage and total current are known, ___ in a series resistive-capacitive circuit can be calculated by multiplying the voltage and current.
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When frequency is changed, the only parameter directly affected is the _______, while other parameters are indirectly affected by the change.
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Capacitive voltage is equal to the _________ voltage at all times in a closed loop circuit.
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Study Notes
Capacitive AC Circuits Overview
- A pure capacitive circuit is theoretical and lacks resistance.
- Adding capacitance does not increase current in an AC series circuit.
- Current acts as the reference in simple series circuits.
Capacitor and Power
- Power consumed by a capacitor is positive; power returned is negative.
- Frequency affects capacitive reactance, contradicting the false statement that it does not.
Phase Relationships
- Angle theta indicates how much current leads the source voltage.
- Increased capacitive reactance results in higher circuit impedance.
Circuit Behavior
- In parallel resistive-capacitive circuits, resistive current is in phase with voltage.
- The Pythagorean theorem can calculate source current in parallel resistive-capacitive circuits.
- Series/parallel circuits find application in electronics, contrary to claims against their usage.
Power and Energy
- In pure capacitive circuits, power translates to reactive power.
- Energy usage in a pure capacitive circuit admits half the energy is returned upon discharge, which is false.
Impedance and Circuit Types
- Impedance calculations in series resistive-capacitive circuits do not solely rely on inductance and capacitive reactance.
- In inductive-resistive circuits, apparent power lags, indicating inductance.
Reactance and Frequency
- Capacitive reactance inversely depends on frequency and capacitance.
- Changes in circuit parameters relate directly to changes in frequency or capacitance.
Resistance and Reactance
- Capacitive reactance is quantified in ohms.
- Current remains consistent across components within a series resistive-capacitive circuit.
- In parallel circuits, source voltage remains unaffected by changes in frequency.
Reference Points and Calculations
- Current is used as the reference in series, while voltage serves as the reference in parallel branches.
- The cosine function can derive source voltage if angle theta is known.
- Apparent power in series circuits is the product of known source voltage and total current.
Response to Frequency Changes
- Changing frequency directly impacts capacitive reactance; other parameters experience indirect effects.
- Capacitive voltage equates to source voltage in closed-loop circuits.
Studying That Suits You
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Description
Test your understanding of capacitive AC circuits with these flashcards from Chapter 17. Each card covers key concepts and true or false statements related to the behavior of capacitors in AC circuits. Perfect for students looking to reinforce their knowledge before exams.
