Usb power pack equivalent power theorem

usb power pack equivalent power theorem When we study the response of a portion of the network only when the other parts of the network can be a simple equivalent circuit instead of the inter-title be simplified. No independent power two-terminal network called No Rhythm two-terminal network which can be used to the easiest power two end network, as its equivalent circuit that is an equivalent resistance, this type of problem in the first chapter talked about. Independent power contained within the two-terminal network called active two-terminal network, it must be used a voltage source with resistance Shenlian, or a current source and resistor in parallel equivalents instead, and how to find such an equivalent in power. Is equivalent power theorem to elaborate the content. Equivalent power theorems include Thevenin's theorem and Norton's theorem. The Thevenin theorem: a linear containing bait ends (port) network external role with a voltage source in series with a resistor equivalent alternative equivalent voltage source equal to the open circuit voltage of the two-terminal network containing source equivalent resistance -containing source-end network independent electromotive force short circuit current source open passive two-terminal network equivalent resistance is equal to the application of the superposition principle, should note the following (1) mobile power pack can only be used to calculate the the linear circuit current and the voltage on the nonlinear circuit NA; (2) Usb power pack superposition to pay attention to the voltage and current of the reference direction, to pay attention to the positive and negative voltage component and a current stars male summing. I.e., when the reference direction of a current or a voltage component corresponding to the synthesis of the current or voltage reference direction, before the superposition type that take "No. of each component value is positive substituting positive, negative, substituting negative ; (3) mobile power pack superimposed When an independent power role, other independent power does not act, that is, the voltage source short-circuit the current source is disconnected; (4) power is not a function of voltage and current, it is not modeled on the principle of superposition in the calculated power.