In an AC capacitive circuit current and voltage phase relation is:
Correct answer: B. Current leads voltage by 90o
- A. In-phase
- B. Current leads voltage by 90o
- C. Voltage leads current by 90o
- D. Current leads voltage by 180o
Explanation
It can be seen that the phase at O is zero and the phase at the upper maximum is π/2. thus the current is leading the applied voltage by 90° or π/2.
This question appeared on the ETEA MDCAT 2014 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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