17 AC capacitance

​https://www.youtube.com/watch?v=NPM3wSb7veU

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

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

In a purely capacitive circuit, the current leads the voltage by

degrees.

Open Ended

Explain the key difference between the behavior of current and voltage in a purely capacitive circuit.

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.

Open Ended

How does a capacitor affect the phase relationship between current and voltage in an AC circuit?

Draw

Draw the phasor for a Purely capacitive circuit?

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.

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

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

Labeling

Label the component parts of the Equation

Drag labels to their correct position on the image

Frequency

Capacitive reactance

1 cycle or full rotation

Capacitance

Draw

What Equation do we use to work out Capacitive reactance?

Open Ended

Why is 2 multiplied by 10 to -6

Multiple Choice

What Equation do we used to work out Current with Voltage and resistance

• V=IR

• I = V/R

• P=I2R

• R=V/

Math Response

1 Calculate the capacitive reactance when connected to a 230-volt supply at 50Hz and a 8μf capacitor?

Type answer here

Correct Answer: 398

Deg^°

Rad

Math Response

2 Calculate the capacitive reactance when connected to a 230-volt supply at 200Hz and a 16μf capacitor?

Type answer here

Correct Answer: 50

Deg^°

Rad

Math Response

3 Calculate the capacitive reactance when connected to a 230-volt supply at 75Hz and a 4μf capacitor?

Type answer here

Correct Answer: 530.78

Deg^°

Rad

Math Response

4 Calculate the capacitive reactance when connected to a 230-volt supply at 1000Hz and a 250μf capacitor?

Type answer here

Correct Answer: 0.63

Deg^°

Rad

Math Response

5 Calculate the capacitive reactance when connected to a 230-volt supply at 1000Hz and a 250μf capacitor?

Type answer here

Correct Answer: 0.63

Deg^°

Rad

Math Response

6 Calculate the Current when connected to a 230-volt supply an a Capacitive reactance of 592 ohms ?

Type answer here

Correct Answer: 0.38

Deg^°

Rad

Math Response

7 Calculate the Current when connected to a 400-volt supply an a Capacitive reactance of 42 ohms ?

Type answer here

Correct Answer: 9.52

Deg^°

Rad

Math Response

8 Calculate the Current when connected to a 230-volt supply at 200Hz and a 8μf capacitor?

Type answer here

Correct Answer: 0.58

Deg^°

Rad

Math Response

9 Calculate the Current when connected to a 400-volt supply at 50Hz and a 2μf capacitor?

Type answer here

Correct Answer: 0.25

Deg^°

Rad

Math Response

10 Calculate the Current when connected to a 300-volt supply at 250Hz and a 50μf capacitor?

Type answer here

Correct Answer: 23.56

Deg^°

Rad

Open Ended

Summarize what you learned about capacitors and their uses in electrical installations.