
17 AC capacitance
Presentation
•
Science
•
11th Grade
•
Practice Problem
•
Easy
Alistair Daish
Used 3+ times
FREE Resource
24 Slides • 26 Questions
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​https://www.youtube.com/watch?v=NPM3wSb7veU
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Multiple Choice
Which of the following best describes the primary function of a capacitor?
To store and discharge energy
To generate electricity
To increase resistance in a circuit
To convert AC to DC
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Multiple Select
Which of the following are reasons why resistance is always present in a circuit, making a purely capacitive circuit impossible?
All materials have some resistance to electricity flow
Capacitors themselves have resistance
Voltage cannot be applied to capacitors
Current cannot flow through capacitors
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Fill in the Blanks
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Open Ended
Explain the key difference between the behavior of current and voltage in a purely capacitive circuit.
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Multiple Choice
Based on the leaky bucket analogy, what does the hole in the bucket represent in terms of a capacitor's behavior?
The inability of a capacitor to hold charge indefinitely due to leakage or resistance.
The maximum charge a capacitor can store.
The voltage across the capacitor.
The speed at which the capacitor charges.
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Multiple Choice
Which of the following statements about power in a purely capacitive circuit is correct?
No net power is produced because positive and negative power cancel each other out.
Maximum power is produced at all times.
Power is only produced when the voltage is at its peak.
Power is always positive in a capacitive circuit.
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Open Ended
How does a capacitor affect the phase relationship between current and voltage in an AC circuit?
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Draw
Draw the phasor for a Purely capacitive circuit?
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Multiple Choice
Which of the following best describes capacitive reactance (Xc)?
It is the opposition to current flow by a capacitor in an AC circuit.
It is the resistance offered by a resistor.
It is the voltage drop across an inductor.
It is the power consumed by a capacitor.
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Multiple Choice
Which factors affect the current flowing through a capacitor in an AC circuit?
Size of the capacitor
Voltage applied to the capacitor
Frequency of the AC supply
All of the above
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Multiple Choice
If the frequency of the AC supply increases, what happens to the capacitive reactance (Xc) and the current through the capacitor?
Xc increases, current decreases
Xc decreases, current increases
Xc and current both increase
Xc and current both decrease
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Labelling
Label the component parts of the Equation
Capacitive reactance
Frequency
Capacitance
1 cycle or full rotation
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Draw
What Equation do we use to work out Capacitive reactance?
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Open Ended
Why is 2 multiplied by 10 to -6
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Multiple Choice
What Equation do we used to work out Current with Voltage and resistance
V=IR
I = V/R
P=I2R
R=V/
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Math Response
1 Calculate the capacitive reactance when connected to a 230-volt supply at 50Hz and a 8μf capacitor?
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Math Response
2 Calculate the capacitive reactance when connected to a 230-volt supply at 200Hz and a 16μf capacitor?
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Math Response
3 Calculate the capacitive reactance when connected to a 230-volt supply at 75Hz and a 4μf capacitor?
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Math Response
4 Calculate the capacitive reactance when connected to a 230-volt supply at 1000Hz and a 250μf capacitor?
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Math Response
5 Calculate the capacitive reactance when connected to a 230-volt supply at 1000Hz and a 250μf capacitor?
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Math Response
6 Calculate the Current when connected to a 230-volt supply an a Capacitive reactance of 592 ohms ?
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Math Response
7 Calculate the Current when connected to a 400-volt supply an a Capacitive reactance of 42 ohms ?
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Math Response
8 Calculate the Current when connected to a 230-volt supply at 200Hz and a 8μf capacitor?
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Math Response
9 Calculate the Current when connected to a 400-volt supply at 50Hz and a 2μf capacitor?
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Math Response
10 Calculate the Current when connected to a 300-volt supply at 250Hz and a 50μf capacitor?
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Open Ended
Summarize what you learned about capacitors and their uses in electrical installations.
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