When A.C current passes through a capacitor then the current relationship will be_______________?
Correct answer: A. The current lead voltage by phase angle is 90 degrees
- A. The current lead voltage by phase angle is 90 degrees
- B. The voltage leads current by phase angle is 90 degrees
- C. The current lead voltage by phase angle is 45 degrees
- D. The voltage leads current by phase angle is 45 degrees
Explanation
In a capacitive AC circuit, the current leads the voltage by 90 degrees because i = C(dV/dt), so current responds to the changing voltage. The likely wrong choice is b, caused by reversing the capacitor phase rule and stating that voltage leads current.
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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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