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Blog Archive

  • Kirchhoff's Circuit Laws,Thévenin's and Norton's Theorems


    Kirchoff's Laws

    Kirchoff's laws still hold true in phasors, with no alterations.

    Kirchoff's Current Law

    Kirchoff's current law states that the amount of current entering a particular node must equal the amount of current leaving that node. Notice that KCL never specifies what form the current must be in: any type of current works, and KCL always holds true.

    [KCL With Phasors]

    Kirchoff's Voltage Law

    KVL states: The sum of the voltages around a closed loop must always equal zero. Again, the form of the voltage forcing function is never considered: KVL holds true for any input function.

    Thevenin and Norton Circuits

    Thevenin Circuits and Norton Circuits can be manipulated in a similar manner to their DC counterparts: Using the phasor-domain implementation of Ohm's Law.
    It is important to remember that the does not change in the calculations, although the phase and the magnitude of both the current and the voltage sources might change as a result of the calculation.

  • basic electronics Ohm's law Series and Parallel Circuits

     

    Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance,one arrives at the usual mathematical equation that describes this relationship
    Components of an electrical circuit or electronic circuit can be connected in many different ways. The two simplest of these are called series and parallel and occur very frequently. Components connected in series are connected along a single path, so the same current flows through all of the components. Components connected in parallel are connected so the same voltage is applied to each component

  • Introduction to Cell division and Mitosis

    Living cells divide to form new cells in order to repair worn-out or damaged tissues throughout an organism, and (in the gametes only) to enable the exchange of genetic material at the initial stage of the process of sexual reproduction. (A gamete is a mature sex cell, specifically the ovum of the female or the spermatozoon of the male.)
    The two types of cell division are generally called mitosis and meiosis

  • An Overview of Pulmonary and Systemic Circulation


    Pulmonary circulation is the half portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart. The term pulmonary circulation is readily paired and contrasted with the systemic circulation. A separate system known as the bronchial circulation supplies blood to the tissue of the larger airways of the lung. From Wikipedia

  • Anatomy and phisiology of the ear

    The ears are the organs of hearing and equilibrium. The ear is divided into three parts: the external, the middle, and the inner parts. The external ear is the outer, funnel-like structure called the auricle or pinna, and the external auditory meatus is called the external auditory canal. Hearing begins in the external ear, where sound waves are carried through the auricle and canal. The middle ear consists of the tympanic cavity, the tympanic membrane, and three small bones called the ossicles (maleus, incus, and stapes). The tympanic membrane is a thin layer of skin on its outer surface, and on the inner surface, it is covered with mucous membrane. Sound is transmitted from the auditory canal through the auditory meatus. The sound is conducted by the change in pressure on the eardrum and then the three ossicles vibrate.