The capacitive reactance in a pure capacitive D.C circuit is:
Correct answer: D. Infinite
- A. Very small
- B. Very large
- C. Zero
- D. Infinite
Explanation
The capacitive reactance in a pure capacitive DC circuit is infinite. This is because a steady DC voltage causes the capacitor to charge up and then block any further current, acting like an open circuit. Therefore, no current flows through the circuit once the capacitor is fully charged. XC = 1/ωC As, ω = 2πf So, XC = 1/2πf.C In the case of DC, where the frequency ( ω = 2πf ) is zero, the capacitive reactance (XC) becomes infinite, as dividing by zero yields infinity.
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Alternating current through a resistor, capacitor and inductor involves phase relationships between voltage and current, reactance, impedance and energy transfer. A resistor keeps voltage and current in phase, while a capacitor and inductor produce opposite phase shifts, a distinction used in circuit diagrams and numerical calculations.
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