At high frequency in a capacitive circuit, the current will be:
Correct answer: A. Large
- A. Large
- B. Small
- C. Zero
- D. Infinite
Explanation
In a capacitive circuit, as the frequency increases, the capacitive reactance (Xc) decreases. The capacitive reactance is given by the formula:Xc=1/2πfCwhere:(Xc) is the capacitive reactance,(f) is the frequency, and(C) is the capacitance.Since the current (I) in the circuit is given by (I = V/Xc) (where (V) is the voltage), as (Xc) decreases with increasing frequency, the current (I) will increase.So, at high frequency in a capacitive circuit, the current will be large.
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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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