In physics, the Poynting vector represents the directional energy flux (the energy transfer per unit area per unit time) of an electromagnetic field.The SI unit of the Poynting vector is the watt per square metre (W/m 2).It is named after its discoverer John Henry Poynting who first derived it in 1884.: 132 Oliver Heaviside also discovered it independently.

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Biology. Vector (epidemiology), an organism that transmits a pathogen from reservoir to host Vector (molecular biology), vehicle used to transfer genetic material to a target cell, such as: Plasmid vector; T-DNA Binary system or binary vector, a cloning vector used to generate transgenic plants; Cloning vector, a small piece of DNA that can be stably maintained in an organism for cloning

Alternating current (AC) circuits explained using time and phasor animations. Impedance, phase relations, resonance and RMS quantities. A resource page from Physclips: a multi-level, multimedia introduction to physics (download the animations on this page).. AC electricity is ubiquitous not only in the supply of power, but in electronics and signal processing.

Momentum and Collisions. The Astronaut Catch; The Diesel Engine and Flatcar Collision; The Cart and The Brick Part A - 2-kg Brick dropped on a 3-kg Cart

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Using Trigonometry to Determine a Vector's Direction. The direction of a resultant vector can often be determined by use of trigonometric functions. Most students recall the meaning of the useful mnemonic SOH CAH TOA from their course in trigonometry.

Surface charges and the Poynting vector. In this section we try and answer the question: 'How does energy really flow in electric circuits?'. The answer is fairly standard university-level physics but is rarely mentioned in text books. Richard Feynman described the theory as 'mad' (though he agreed it must be true).

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