In practice, circuits containing reactants also contain which of the following?

Circuits containing reactants, such as inductors and capacitors, inherently also include resistance. This concept is tied to the real-world behavior of circuits where nothing is perfectly ideal. In practical scenarios, even components like resistors, capacitors, and inductors exhibit some level of resistance due to their physical properties, materials, and connections.

Resistance plays a crucial role in the functioning of circuits, as it determines how much current will flow for a given voltage applied across a component according to Ohm's law (V = IR). Additionally, resistance affects the overall impedance in AC circuits, which is particularly important when analyzing how reactants behave in conjunction with resistive elements.

While circuits may be designed primarily for their reactive characteristics (like capacitance and inductance), the presence of resistance is unavoidable and impacts power dissipation, signal integrity, and the overall efficiency of the circuit's performance. Therefore, in any practical setting, along with the reactive components, resistance is an integral part of circuit analysis and design.