A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
Correct answer: A. 32Ω
- A. 32Ω
- B. 62Ω
- C. 50Ω
- D. 100Ω
Explanation
Capacitive reactance is Xc = 1/(2πfC) = 1/(2 x 3.14 x 50 Hz x 100 x 10^-6 F) ≈ 31.8 Ω, which is about 32 Ω. The likely wrong choice is b, often caused by using an incorrect frequency or forgetting the microfarad conversion.
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Capacitors store electric charge and energy in an electric field between conductors. Work includes capacitance, the relation Q = CV, dielectric materials, charging and discharging, energy formulas, and combinations of capacitors in series and parallel. Electric potential difference is needed to understand why charge and stored energy change.
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