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Questions and Answers
What happens to a capacitor when the resistance is high and remains relatively the same?
What happens to a capacitor when the resistance is high and remains relatively the same?
Which factor does NOT affect capacitance?
Which factor does NOT affect capacitance?
Which of the following is a characteristic of capacitors?
Which of the following is a characteristic of capacitors?
What is the purpose of the dielectric in a capacitor?
What is the purpose of the dielectric in a capacitor?
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In capacitor testing, what does a high resistance value signify?
In capacitor testing, what does a high resistance value signify?
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What is the primary function of a capacitor?
What is the primary function of a capacitor?
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What happens to current flow across a fully charged capacitor?
What happens to current flow across a fully charged capacitor?
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How does a capacitor behave when a DC voltage is applied?
How does a capacitor behave when a DC voltage is applied?
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What occurs when the battery connected to a charged capacitor is reversed?
What occurs when the battery connected to a charged capacitor is reversed?
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What is a result of applying alternating current (AC) to a capacitor?
What is a result of applying alternating current (AC) to a capacitor?
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What is necessary for a capacitor to hold a large charge for a given voltage?
What is necessary for a capacitor to hold a large charge for a given voltage?
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Which phenomenon occurs during the initial connection of a voltage to a capacitor?
Which phenomenon occurs during the initial connection of a voltage to a capacitor?
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What is the capacitance value of a capacitor that is rated at 2.2 µF?
What is the capacitance value of a capacitor that is rated at 2.2 µF?
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What tolerance percentage applies to a 0.1 µF capacitor?
What tolerance percentage applies to a 0.1 µF capacitor?
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Which type of variable capacitor is best suited for small adjustments?
Which type of variable capacitor is best suited for small adjustments?
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In an RC circuit, what determines the charge time of the capacitor?
In an RC circuit, what determines the charge time of the capacitor?
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What happens to the voltage across a capacitor's plates when power is applied?
What happens to the voltage across a capacitor's plates when power is applied?
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Which letter denotes a capacitor with a tolerance of +/- 0.5pF?
Which letter denotes a capacitor with a tolerance of +/- 0.5pF?
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What component is used for tuning most radio receivers?
What component is used for tuning most radio receivers?
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If a capacitor's capacitance is above 10pF, what is the tolerance for a 10,000pF capacitor?
If a capacitor's capacitance is above 10pF, what is the tolerance for a 10,000pF capacitor?
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What is the time constant for the RC circuit described with a 10 kΩ resistor and a 100 µF capacitor?
What is the time constant for the RC circuit described with a 10 kΩ resistor and a 100 µF capacitor?
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How much time is required for the voltage across the capacitor to reach 63.2% of the source voltage in the given RC circuit?
How much time is required for the voltage across the capacitor to reach 63.2% of the source voltage in the given RC circuit?
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What is the time required for complete discharge for the first circuit?
What is the time required for complete discharge for the first circuit?
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In a parallel configuration of capacitors, how is the voltage drop across the capacitors described?
In a parallel configuration of capacitors, how is the voltage drop across the capacitors described?
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When discharging a capacitor with a time constant of 0.4 seconds, how much voltage will remain after one time constant has elapsed?
When discharging a capacitor with a time constant of 0.4 seconds, how much voltage will remain after one time constant has elapsed?
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How is the voltage drop across capacitors in series related to their capacitance?
How is the voltage drop across capacitors in series related to their capacitance?
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What is the total time it takes for a capacitor to fully discharge in the described RC circuit with a time constant of 0.4 seconds?
What is the total time it takes for a capacitor to fully discharge in the described RC circuit with a time constant of 0.4 seconds?
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If the resistance in a timing circuit is increased from 10 kΩ to 20 kΩ while keeping capacitance constant, what will happen to the time constant?
If the resistance in a timing circuit is increased from 10 kΩ to 20 kΩ while keeping capacitance constant, what will happen to the time constant?
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What is the voltage across the capacitor after 1 time constant during charging in the first circuit?
What is the voltage across the capacitor after 1 time constant during charging in the first circuit?
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What voltage level is reached across a capacitor after 5 time constants in the described circuit?
What voltage level is reached across a capacitor after 5 time constants in the described circuit?
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What happens to the total capacitance when capacitors are connected in parallel?
What happens to the total capacitance when capacitors are connected in parallel?
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If a capacitor is charged to 28 VDC, what will be the voltage across each capacitor if they are in parallel?
If a capacitor is charged to 28 VDC, what will be the voltage across each capacitor if they are in parallel?
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In an RC circuit with a capacitor charged to 100 volts, how much voltage is left after 2 time constants if the time constant is 0.4 seconds?
In an RC circuit with a capacitor charged to 100 volts, how much voltage is left after 2 time constants if the time constant is 0.4 seconds?
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What is the time required for complete charge in the second circuit?
What is the time required for complete charge in the second circuit?
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Which of the following describes the behavior of voltage across the capacitor during the charging phase?
Which of the following describes the behavior of voltage across the capacitor during the charging phase?
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After 1 time constant during discharge of the second circuit, what is the voltage across the capacitor?
After 1 time constant during discharge of the second circuit, what is the voltage across the capacitor?
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What effect does increasing the area of the plates have on the capacitance of a capacitor?
What effect does increasing the area of the plates have on the capacitance of a capacitor?
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How does the distance between capacitor plates affect capacitance?
How does the distance between capacitor plates affect capacitance?
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What is the effect of connecting capacitors in parallel?
What is the effect of connecting capacitors in parallel?
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Which formula is used to calculate total capacitance for capacitors in series?
Which formula is used to calculate total capacitance for capacitors in series?
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What characterizes a dielectric material?
What characterizes a dielectric material?
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What happens to capacitance when the distance between plates is increased?
What happens to capacitance when the distance between plates is increased?
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What is NOT a factor that affects capacitance?
What is NOT a factor that affects capacitance?
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How does the use of a dielectric material impact a capacitor's performance?
How does the use of a dielectric material impact a capacitor's performance?
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Study Notes
Module 3: Electrical Fundamentals, Topic 3.9: Capacitance/Capacitor
- A capacitor is a device used to store electrical charge.
- Capacitance describes a capacitor's ability to store charge.
- Factors affecting capacitance include the distance between plates, area of plates, number of plates, dielectric material and its constant, working voltage, voltage rating.
- Different capacitor types exist, each with unique construction and functions.
- Calculations involving capacitance and voltage in series and parallel circuits are essential.
- Capacitors exhibit exponential charge and discharge behaviour governed by time constants.
- Capacitor testing involves visual inspection for swelling and ensuring the capacitor is fully discharged before handling.
- Capacitance measurement techniques and tools are used to determine capacitance values (e.g., capacitance meter, multimeter).
- Important considerations for capacitor use include polarity, voltage ratings, and dielectric strength.
- Different dielectric materials exist with varying dielectric strengths and constants (e.g., air, mica, tantalum oxide, etc.).
- Basic capacitor operation involves the build-up of charge on plates as current flows until it reaches its maximum, and then ceases.
- Capacitors block DC current but allow AC current to flow.
- Common capacitor types include paper, mica, ceramic, and electrolytic.
- Tantalum capacitors are a newer type of electrolytic capacitor with higher costs and are polarity sensitive.
- Understanding capacitor behavior in parallel and series configurations is crucial for circuit analysis and design.
- Time constant calculations are important for determining the charging and discharging time of capacitors in circuits.
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Description
This quiz delves into the essentials of capacitance and capacitors, exploring key concepts like capacitance, factors affecting it, and measurement techniques. Participants will also learn about capacitor types, testing, and crucial considerations for their safe usage in circuits.
