Capacitive Reactance and Circuit Behavior

The video tutorial explains capacitive reactance, impedance, and RMS current in AC circuits. It covers calculations for capacitive reactance using the formula XC = 1/(2πfC), impedance using Z = √(R² + (XL - XC)²), and RMS current using V = IR. The tutorial also discusses power absorption in circuits, emphasizing that resistors absorb energy while capacitors do not. It highlights the relationship between frequency and capacitive reactance, explaining how capacitors can filter AC signals. The video concludes with a discussion on how capacitors block DC signals but allow AC signals to pass.

What is the formula for calculating capacitive reactance?

• XC = 2πF/C

• XC = 1/(2πFC)

• XC = F/(2πC)

• XC = 2πFC

In the given circuit, what is the value of the capacitive reactance?

• 40 ohms

• 12 ohms

• 53.05 ohms

• 66.44 ohms

How is the impedance of a circuit with no inductors calculated?

• Z = R + XC

• Z = √(R² + XC²)

• Z = √(R² - XC²)

• Z = R - XC

What is the RMS current in the circuit if the source voltage is 12 volts and the impedance is 66.44 ohms?

• 0.2206 A

• 0.1806 A

• 0.1506 A

• 0.2006 A

Why do the voltages across the resistor and capacitor not add up to the source voltage?

• Due to incorrect calculations

• Because the circuit is open

• Because of phase differences

• Due to a faulty capacitor

Which component in the circuit absorbs energy but does not release it back?

• AC Source

• Inductor

• Resistor

• Capacitor

What is the power factor in the circuit if the resistance is 40 ohms and the impedance is 66.44 ohms?

• 0.702

• 0.602

• 0.802

• 0.502

How does a capacitor behave in a DC circuit?

• It converts DC to AC

• It amplifies DC

• It blocks DC

• It allows DC to pass

What happens to capacitive reactance as the frequency of an AC signal increases?

• It becomes zero

• It remains constant

• It decreases

• It increases

Which type of AC signal can easily bypass a capacitor?

• Medium frequency

• No frequency

• High frequency

• Low frequency