Capacitive Reactance Concepts

The video tutorial by Stan Java from the Black Hills of Dakota Territory explains the concept of capacitive reactance, its relationship with frequency, and how it differs from inductive reactance. The tutorial references the book 'Teach Yourself Electricity and Electronics' and provides a detailed example calculation of capacitive reactance using a calculator. The video also discusses the use of the J operator in expressing reactance and concludes with a personal note from the presenter.

What happens to capacitive reactance as frequency increases for a fixed capacitance?

• It decreases.

• It remains constant.

• It increases.

• It becomes zero.

How is capacitive reactance mathematically expressed?

• Xc = 1/(2πFC)

• Xc = 2π/F

• Xc = 2πFC

• Xc = FC/2π

Why do engineers consider capacitive reactance to be negative?

• To align with resistance values.

• To make it easier to measure.

• To distinguish it from inductive reactance.

• To simplify calculations.

What is the J operator in the context of reactance?

• A real number.

• An imaginary number.

• A rational number.

• A complex number.

What is the value of J squared?

• 2

• 0

• -1

• 1

In the example calculation, what is the capacitive reactance of a 0.01 microfarad capacitor at 100 kHz?

• -159 ohms

• 159 ohms

• -100 ohms

• 100 ohms

If the capacitance is doubled, what happens to the capacitive reactance?

• It halves.

• It doubles.

• It remains the same.

• It becomes zero.

What effect does tripling the frequency have on capacitive reactance?

• It triples.

• It halves.

• It reduces to one-third.

• It remains unchanged.

How does reducing the capacitance to one-seventh affect the capacitive reactance?

• It becomes seven times greater negatively.

• It becomes zero.

• It remains unchanged.

• It becomes seven times smaller negatively.

What is the relationship between capacitive reactance and frequency?

• Directly proportional

• Exponentially related

• Inversely proportional

• Unrelated