Instanttaneous Power And Average Power Flowing To A One-Port Network
TECTechnics Classroom   TECTechnics Overview

Instanttaneous Power And Average Power Flowing To A One-Port Network (a) What is a one-port network?
(b) What is a two-port network?
(c) A one-port network with passive sign convention has v = Vmcos ωt V and i = I1 + I2cos (ωt + θ) A
Determine: (i) the instantaneous power flowing to the the network; (ii) the average power to the network. The strings: S7P3A32 (force - push).

The math:
Pj Problem of Interest is of type force (push).

(a) A pair of terminals constitute a port: if there is an identifiable voltage across the terminals and the current into one terminal is the same as the current out of the other terminal. is
Figure 1.1(a) consists of two one-port networks (A and B). Network, A is a one-port network when viewed from from the left of terminals 1, 2. Network B is a one-port network when viewed from the right side of terminals 1,2.

(b) Figure 1.1(b) is a two-port network if currents I1in and I1out are equal; and currents I2in and I2out are equal. The four variables V1, V2, I1 and I2 (only two of which can be independent) characterize the network.

(ci) A one-port network with a passive sign convention implies that current is directed from the positive to the negative terminal.
Instantaneous power = p(t) = v(t)i(t) = Vmcos ωt[I1 + I2cos (ωt + θ)] = VmI1cos ωt + VmI2cos ωtcos (ωt + θ).
VmI2cos ωtcos (ωt + θ) = VmI2[cos 2(ωt + θ) + cosθ]; base on the product-sum trigonometric identity;
Cos A cos B = 1/2[cos (A - B) + cos (A - B)].

(cii) Average power Po = 1/(2π)[(∫ p(t)dt) t=2π - (∫ p(t)dt) t=0]
After expansion of the trigonometric function and integration:
Po = (1/2)VmImcos θ.

Math The Universe is composed of matter and radiant energy. Matter is any kind of mass-energy that moves with velocities less than the velocity of light. Radiant energy is any kind of mass-energy that moves with the velocity of light.
Periodic Table
Composition And Structure Of Matter
How Matter Gets Composed
How Matter Gets Composed (2)
Molecular Structure Of Matter
Molecular Shapes: Bond Length, Bond Angle
Molecular Shapes: Valence Shell Electron Pair Repulsion
Molecular Shapes: Orbital Hybridization
Molecular Shapes: Sigma Bonds Pi Bonds
Molecular Shapes: Non ABn Molecules
Molecular Orbital Theory
More Pj Problem Strings

Blessed are they that have not seen, and yet have believed. John 20:29