In simple A.C capacitive circuit:
Correct answer: C. The current leads voltage by 900
- A. The voltage leads current by 900
- B. The voltage leads current by 1800
- C. The current leads voltage by 900
- D. The current and voltage are in phase
Explanation
In A.C capacitive circuits, the current leads the voltage by 90° because first, the current flows through the two plates of the capacitor, where the charge is stored, after that the charge accumulates at the plates of the capacitor and causes an establishment of a voltage difference.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About AC Through Resistor, Capacitor and Inductor
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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