What type of material resists the passage of electrical current?

The correct answer is the type of material known as an insulator. Insulators are materials that do not allow electrical current to flow freely through them. They are characterized by their high resistance to the movement of electrons, which makes them effective for preventing unwanted electrical conductivity. This property is essential in various applications, such as in the insulation around wires, where they help protect users from electric shock and ensure that electrical energy is effectively directed along intended pathways.

In contrast, conductors, such as metals, easily allow the flow of electrical current due to their low resistance. Resistors, while they do resist current, are components specifically designed to limit the flow of electricity in a circuit, rather than serving as a barrier like insulators. Capacitors, on the other hand, store electrical energy and are not primarily defined by their ability to resist electrical current. Thus, insulators are the materials that effectively prevent the passage of electrical current, making them the correct choice.