In the capacitive circuit the current___________________?
Correct answer: D. Leads forward the voltage by π/2
- A. Lags behind voltage by π/2
- B. Is in phase with voltage
- C. Opposite in phase of voltage by π
- D. Leads forward the voltage by π/2
Explanation
For a pure capacitor, current leads the voltage by π/2, or 90 degrees, because current is proportional to the rate at which voltage changes. The likely wrong choice is a, which incorrectly applies the phase relationship of an inductor, where current lags voltage by 90 degrees.
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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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