True power is defined in relation to which of the following?

True power, also known as real power, is fundamentally defined in relation to load resistance. It represents the actual power consumed by a load to perform useful work, measured in watts (W). The formula for calculating true power is derived from Ohm’s Law and is expressed as the product of the voltage across the load, the current through the load, and the cosine of the angle (power factor) between them.

However, what solidifies the importance of load resistance in this context is that true power is specifically concerned with the power that is used to do work and is dependent on the load's resistance in an electrical circuit. This means that it is the resistance that influences how much current flows for a given voltage, and consequently, how much power is actually converted to useful work versus power that may be reactive and does not perform any useful task.

While power factor plays a role in the relationship between true power, apparent power, and reactive power, the direct definition of true power is most accurately linked to the load resistance. Understanding load resistance helps to clarify how much of the total power supplied is being effectively utilized as true power.