In this video, Paul Andersen explains how constructive and destructive interference can create interference patterns. Interference patterns can be created by all types of waves, including water, sound, and light. A classic experiment that demonstrates interference patterns is the monochromatic double slit experiment. [3:31]

In this video, Paul Andersen explains how Kirchhoff's Junction Rule can be applied to series and parallel circuits. Kirchhoff's Junction Rule is an application of the conservation of charge. The current into a junction will always equal the current out of a junction. [5:21]

In this, video Paul Andersen explains how Kirchhoff's Loop Rule can be used to calculate the voltage of different components of a circuit. The sum voltage throughout an entire loop will sum to zero following the law of conservation of energy. An analogy and several examples are included. [9:35]

In this video, Paul Andersen explains how ray diagrams for lenses can be used to determine the size and location of a refracted image. Images may be either real or virtual images. Ray diagrams for converging and diverging lenses are included. [7:26]

In this video, Paul Andersen explains how ray diagrams can be used to determine the size and location of a reflected image. Ray diagrams for plane, concave, and convex mirrors are included. [11:44]

In this video, Paul Andersen explains how light can be refracted, or bent, as it moves from one medium to another. The amount of refraction is determined by the angle of incidence and the index of refraction. Snell's Law can be used to calculate the angle of refraction. [11:20]

In the following video, Paul Andersen explains how waves will diffract (or bend) around an obstacle or while traveling through an opening. Diffraction will be maximized when the size of the opening or obstacle matches the wavelength. [4:20]

Paul Andersen explains how waves interact with objects and other waves. When a wave hits a fixed object, it will be reflected and inverted. When a wave hits a free object, it will be reflected without being inverted. [6:24]

Paul Andersen explains how population ecology studies the density, distribution, size, sex ration, and age structure of populations. Intrinsic growth rate and exponential growth calculations are included along with a discussion of logistic growth. Utilize the associated concept map and video. [12:10]

In the following video Paul Andersen explains for the position of an object over time can be used to calculate the velocity and acceleration of the object. If a net force acts on a object it will experience an acceleration. [7:55]

Mr. Andersen shows you how to interpret a position vs. time graph for an object with constant velocity. The slope of the line is used to find the velocity. A PhET simulation is also included. [12:19]

Mr. Andersen shows you how to read a position vs. time graph to determine the velocity of an object. Objects that are accelerating are covered in this video. He also introduces the tangent line (or the magic pen). [13:01]

In the following video Paul Andersen explains how conservative forces can be used to store potential energy in an object or a system. The work done is equal to the amount of potential energy in the object. The following conservative forces are described; gravitational, spring and electric force. [6:39]

Paul Andersen discusses the technology, advantages and disadvantages of six sources of renewable energy; biomass, hydroelectric, solar, geothermal wind, and hydrogen. He also explains how changes in the storage and flow of energy in our power grid must be improved. [9:21]

Paul Andersen explains how the resistivity of a material opposes the flow of charge. [4:22]

The following video narrated by Paul Andersen explains how resistors and capacitors affect circuits. The resistance of a resistor is affected by the resistivity of the material and the geometry of the resistor. The current through a resistor can be determined by Ohm's Law. [9:16]

Paul Andersen starts this video with a description of the respiratory surface. He explains how worms, insects, fish, and mammals take in oxygen and release carbon dioxide. He then tours the major organs of the respiratory system; from the pharynx to the trachea, bronchus, bronchiole and alveoli. A video review worksheet is also provided. [8:45]

Physics video [10:40] from science teacher, Paul Andersen, in which he teaches us the concept of rotational force through images and formulas using clear and understandable explanations.

Paul Andersen describes the important features of the skeletal system. He starts by comparing and contrasting endoskeletons and exoskeletons. He then explains how the human skeleton provides support, movement, storage, blood production, and homeostasis. [7:58]

Paul Andersen explains how soils are formed and classified. Weathering of rock creates particles which are mixed with water, air, and organic material. Soils are classified according to particle size, chemical makeup, and horizon distribution. [9:22]