Final answer:
The principle in question is the conservation of energy in electrical circuits, stating that in an ideal circuit with a voltage source and a resistor, the input power and output power should be equal. However, real-world rectifier circuits can have inefficiencies causing the output real power to be less than the input real power.
Step-by-step explanation:
The concept in question is related to the principle of conservation of energy in electrical circuits and is a topic within Physics.
In an ideal scenario, with one voltage source and a single resistor, the power supplied by the voltage source is equal to the power dissipated by the resistor. This is due to the fact that energy cannot be created or destroyed, only converted from one form to another. When dealing with real-world rectifier circuits, however, there are inefficiencies and additional components that might cause the output real power to the load to be less than the input real power from the source.
According to the law of energy conservation, the power introduced into a primary winding by a voltage source must equal the power dissipated in a secondary circuit resistor, thus satisfying the equation ip(t)up(t) = is(t)us(t). However, complications arise in non-ideal circuits where components such as diodes and capacitors may introduce losses, meaning that the output power to the load can be less than the power absorbed from the input voltage source.