Flashcards on Resistor, inductor and capacitor in an AC circuit
Resistor, Inductor & Capacitor in an AC Circuit: Analysis & Examples
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28 cards
Card 1
Question: How do AC circuits differ from DC circuits regarding voltage and current over time?
Answer: In AC circuits, voltage and current periodically reverse direction, while in DC circuits, they remain constant over time.
Card 2
Question: What is the general characteristic of an alternating current (AC) waveform?
Answer: An alternating current (AC) is characterized by its sinusoidal waveform, meaning its magnitude and direction vary cyclically over time.
Card 3
Question: What is the equation for a typical AC voltage?
Answer: V(t) = V_peak · sin(2πft + φ), where V_peak is the maximum voltage, f is the frequency in hertz (Hz), t is time in seconds (s), and φ is the phase ang
Card 4
Question: What is the equation for a typical AC current?
Answer: I(t) = I_peak · sin(2πft + θ), where I_peak is the maximum current and θ is the phase angle of the current.
Card 5
Question: How do resistors behave in AC circuits compared to DC circuits?
Answer: In AC circuits, when an AC voltage is applied across a pure resistor, the current through the resistor is directly proportional to the voltage across
Card 6
Question: What is the phase relationship between instantaneous voltage and instantaneous current in a pure resistor in an AC circuit?
Answer: The instantaneous voltage V_R(t) across the resistor and the instantaneous current I_R(t) through it are always in phase.
Card 7
Question: If the voltage across a resistor in an AC circuit is V_R(t) = V_R,peak · sin(2πft), what is the current through it?
Answer: I_R(t) = I_R,peak · sin(2πft), where I_R,peak = V_R,peak / R.
Card 8
Question: Does the resistance of a resistor change with AC frequency?
Answer: No, the resistance R, measured in ohms (Ω), remains constant regardless of the AC frequency.
Card 9
Question: How is the average power dissipated by a resistor in an AC circuit calculated?
Answer: The average power dissipated is P = I_RMS² · R = V_RMS² / R, where I_RMS and V_RMS are the root-mean-square values of current and voltage, respectivel
Card 10
Question: How does an inductor behave in an AC circuit?
Answer: An inductor opposes changes in current due to its property of inductance. The continuously changing current induces a back electromotive force (EMF) t