Which of the following is not a reactive component in electrical systems?

In electrical systems, reactive components are those that store energy in the form of electric or magnetic fields. Inductors and capacitors are classic examples of reactive components, as they either store energy in a magnetic field (inductor) or in an electric field (capacitor).

On the other hand, a resistor is a component that dissipates energy in the form of heat and has a purely resistive impedance, which means it does not store energy. The behavior of a resistor is characterized by Ohm’s Law, where voltage and current are directly proportional, with no phase difference between them.

While transformers are not purely reactive in the traditional sense, they do involve magnetic fields and can be considered reactive in how they operate on alternating current. However, their main function is to change voltage levels while transferring energy.

In summary, the resistor stands out because it does not have the reactive properties associated with inductors and capacitors, making it the only non-reactive component in the provided options.