What is characteristic of a low impedance circuit?

A low impedance circuit is characterized by low resistance, which allows a higher amount of current to flow through the circuit when a voltage is applied. In such circuits, the relationship between voltage, current, and resistance is described by Ohm's Law (V = IR). With low resistance, for a given voltage (V), the current (I) will be high.

This fundamental principle explains why option B is the correct choice. In low impedance scenarios, the circuit allows for high current flows, as the low resistance facilitates this. Essentially, low impedance circuits are those where the restriction to current flow is minimal, resulting in greater current output for a particular voltage input.

The characteristics of other options diverge from this principle: a low current and high voltage scenario (as implied in option A) describes a different relationship; high resistance (suggested by option C) would restrict current; and low resistance (as described in option D) supports the notion of high current, but does not encapsulate the full context of low impedance, which is fundamentally tied to the current flow under conditions of lower resistance.