Inductors Questions

• Inductor quality factor (Q): For a practical inductor modeled as an ideal L in series with winding resistance R, the quality factor Q at a given frequency is the ratio of inductive reactance to resistance, Q = X_L / R. Decide whether this statement is correct.
• Dynamic behavior — do inductors “boost” current?: Inductors oppose rapid changes in current; they do not inherently amplify or “boost” current flow. Evaluate the correctness of the claim that an inductor will boost current.
• DC through an inductor — what limits it?: In a DC circuit after transients, the current through an ideal inductor is limited by the total series resistance in the loop (source resistance plus any resistors). Decide whether this statement is correct.
• Transformers and DC: Can a conventional transformer step up or step down a DC voltage directly (without switching or chopping)? Choose the correct evaluation.
• Phase relation in a parallel RL circuit: In AC analysis, does the inductor branch current lead or lag the resistor branch current in a parallel RL network? Evaluate the statement: “Inductor current leads the resistor current.”
• Transformer terminology — primary vs secondary: The primary winding of a transformer is the winding connected to the source, while the secondary is connected to the load. Assess the claim: “The primary winding is the side connected to the load.”
• Inductors in series — two ideal inductors are connected end-to-end (series). If L1 = 0.20 mH and L2 = 0.40 mH, what is the total equivalent inductance seen by the source?
• Inductor cores — what does the term “air-core inductor” most accurately imply about the material inside the coil former?
• Coil parasitics — the inherent DC resistance of an inductor's wire winding is called what?
• Inductor dynamics — which quantity in an ideal inductor cannot change instantaneously at the exact moment a switching event occurs?
• Solving for an unknown series inductor — three uncoupled inductors are in series. If L1 = 120 mH, L2 = 70 mH, and the measured total inductance is 340 mH, what is the value of L3?
• First-order transient rule of thumb — after exactly one time constant (τ) in a first-order RL or RC response, by what percentage has the transient changed, and what percentage remains?
• Opposition to AC in an inductor — the specific term for an inductor’s frequency-dependent opposition to alternating current is what?
• Compute total inductive reactance — two uncoupled inductors are in series and driven at f = 1.0 kHz. If L1 = 0.30 H and L2 = 0.25 H, what is the total inductive reactance as seen by the source?
• Power terms in AC circuits — which type of power explicitly represents the power at a specific instant in time (the instantaneous rate of energy transfer), rather than the cycle-averaged value?
• Single-inductor reactance — in a circuit operating at f = 1.4 kHz, an inductor L2 has inductance 0.50 H. What is the inductive reactance of L2?
• Electromagnetic induction in electrical engineering Electromagnetic induction is the physical process by which one form of energy creates the other when a magnetic field and an electric circuit interact. In standard terminology, electromagnetic induction is the generation of what quantity from what cause?
• Inductor behavior with alternating current The opposition offered by an ideal inductor to alternating current (AC) is quantified by inductive reactance. Inductive reactance is directly proportional to which parameter in steady-state sinusoidal analysis?
• Energy and polarity in an inductor during a decreasing current When the current through an ideal inductor is forced to decrease, what happens to the inductor’s magnetic field and to the instantaneous voltage polarity across the inductor terminals?
• RL step response timing In a simple series RL circuit excited by a DC step, the inductor current rises toward its final value exponentially with time constant τ = L / R. After exactly two time constants have elapsed, the current reaches approximately what percentage of its final steady-state value?