How to judge the power supply and load in electrical engineering?
The power supply and the load are relative, the power is the power supply, and the absorbed power is the load. For an ideal voltage source and a current source, the current is transmitted from a low potential to a high potential flow.
The book does not have a clear definition: Power: current flows from the positive electrode to release power; load: current flows from the positive to the absorbed power.
Methods to distinguish between the source and the load in the circuit, is generally based on the results: if the element sends power (i.e. the voltage element and through the actual direction element current non connected direction), that element is power; if the element absorption power (i.e. voltage across the element and through the actual direction element for current), that element is associated with the direction of load. In the calculation according to the general components and voltage through the current reference direction in components to assume that when the voltage, denoted by the circuit model in the current non associated reference direction, according to the power supply, if the voltage and current circuit model for parallel labeling the reference direction, must according to the processing load, and the true nature of the elements determined according to the calculation results to be.
In the circuit, voltage and current product is negative (opposite sign) for the general power supply, product is positive (the same sign) is generally supported. But not all. For example, two different voltage source through a resistor in parallel, high power supply voltage for charging, the power supply voltage is low however, this can also be understood as the low voltage power supply load.
