310102k Inductance and Inductive Reactance 2025(TF)

Inductance

The property of a coil (inductor) that opposes a change in current.

Inductive Reactance

The opposition that an inductor offers to the change of current in an AC circuit.

Henry

The unit of measurement for inductance, abbreviated as 'H'.

Lenz's Law

A law stating that the direction of induced current is such that it opposes the change in magnetic flux that produced it.

Counter emf

The emf induced in a coil due to self-induction, opposing the original current change.

Time Constant

The time required for the current in a DC circuit to reach approximately 63.2% of its final steady-state value, calculated as L/R.

Reactive Power

Power that is stored and then returned to the circuit, represented as reactive voltage times reactive current.

AC Circuit

An electrical circuit in which the current alternates direction periodically.

DC Circuit

An electrical circuit in which the current flows in one direction only.

Factors affecting Inductance

Number of wire turns (N), permeability of core (μ), length of magnetic path (l), and cross-sectional area (A).

Impedance Triangle

A graphical representation of the relationship between resistance (R), inductive reactance (XL), and total impedance (Z) in an AC circuit.

Faraday’s Law

The law stating that a change in magnetic flux through a conductor induces a voltage in the conductor.

Inductor

A passive electronic component that stores energy in a magnetic field when electric current flows through it.

Voltage (V)

The electrical potential difference between two points, measured in volts.

Current (I)

The flow of electric charge, measured in amperes.

Resistance (R)

The opposition to the flow of current, measured in ohms (Ω).

Flux Density

The amount of magnetic flux in a given area, affecting the induced voltage in AC generation.

Frequency (F)

The number of cycles per second in an AC signal, which affects inductive reactance.

Power Relationships

The interactions between voltage, current, and power in an inductive circuit, including true power, reactive power, and apparent power.

Coils, Motors, & Transformers

Common types of inductors used in electrical circuits, each with their specific inductance characteristics.

Impedance (Z)

The total opposition that a circuit presents to alternating current, including both resistance and reactance.