Engineering in Kenya

# Physics

## Energy in Electrical Engineering in Kenya

Posted by on Aug 21, 2018 in Physics | 0 comments

For Electrical Engineering in Kenya, energy is defined as the capacity to do work. An object may have mechanical energy by virtue of its position, internal structure or its motion. There are also other forms of energy save for mechanical, namely: chemical energy (found in foods, oils, charcoal, biogas etc. and is due to the kinetic energy and the potential energy of electrons within atoms), electrical energy (associated with the electric charge and can be produced by generators from hydroelectric power stations waterfalls, geothermal stations, nuclear fissions etc.), nuclear energy from a nuclear reactor, thermal energy (due to heat produced from burning fuels, the sun, heaters etc.). In Electrical Engineering in Kenya, it is a remarkable fact about our physical universe that whenever one form of energy is lost by a body/ system, this energy never disappears but is merely translated into other forms of energy e.g. vehicles burn fuel to produce both thermal (heat) and mechanical energy.Engineering in Kenya has more information.

# Mechanical Energy in Electrical Engineering in Kenya

It is the energy of motion – whether that energy is in action or stored. It exists in two forms;

Kinetic energy in Electrical Engineering in Kenya – this is energy possessed by a body by virtue of its motion and it represents the capacity of the body to do work by virtue of its speed. For Electrical Engineering in Kenya, if a force F acts on an object of mass m such that the mass accelerates uniformly from initial velocity v1 to a final velocity v2 over a distance s; then, work done over the distance s is

W = FS. But F = ma, and S = ut + ½at2. From the relation v = u + at, then;

t = (v-u)/a so that the work done is W = ma.s = ½m (v2 – u2) = ∆ke which is the work-energy relation theorem. In Electrical Engineering in Kenya, if a body starts from rest, then the work done on the object = kinetic energy gained by the object.

## Geometric Optics

Posted by on Aug 19, 2018 in Physics | 0 comments

Geometric optics it is the study of light waves in different type of environment. Geometric optics is concerned with the images that result when spherical waves fall on flat and spherical surfaces. Geometric optics helps to understand how images can be formed either by reflection or by refraction and how mirrors and lenses work because of reflection and refraction. Form the ray approximation it is known that light travels in straight lines. Both of these steps lead to valid predictions in the field called geometric optics the objects of study in the field of wave optics. Read more articles in Engineering in Kenya

# Principles of Geometric optics

The simple geometric optics techniques are used to examine the properties of the images formed by flat or spherical surfaces. Approximations of geometrical optics which use ray model of light; is used to analyze the formation of images by assuming the light to travel in straight line paths or rays whereby rays are drawn perpendicular to the wave front in a direction the travel of the wave. In 1678, Christian Huyghens suggested a simple theory of light as a wave. This wave theory of light constitutes a technique for describing wave motion. Huyghens ‘theory is based on a geometrical construction that enables us to know where a given wave front will be at any time in the future if we know its present position which is also the geometric optics.

In geometric optics the Huyghens principle can be used to derive geometrically the laws of reflection and refraction. The Huyghens’ principle which states that, all points of a wave front can be considered as a source of secondary spherical wavelets which spread out in all directions, show that the angle of incidence is equal to the angle of reflection (θi = θ’r )  which forms the law of reflection in geometric optics. The principle is the Fermat’s principle which state that a light of ray travelling from one fixed point to another fixed point follow a path such that compared with a nearby path , the time required is either minimal or maximum or remain unchanged that is, stationary also used in the derivation of image in geometric optics.

## Physics Past Papers on Natural Science Review

Posted by on Aug 16, 2018 in Physics | 0 comments

There have been numerous physics past papers from every topic or book you may think of. Today in this article, I review on those past papers that touched on natural science

Natural sciences are divisions of science that seek to explain the rules that administrate the natural world using scientific methods. Natural science is used to differentiate the theme from the social sciences.

Social sciences apply the scientific way of studying social patterns and human behavior; the humanities, which employ an analytical or critical to study the human condition; and the formal sciences including logic and mathematics, which use an a priori, as opposed to studying formal systems using factual methodology.

## Health Physics Jobs

Posted by on Aug 15, 2018 in Physics | 0 comments

Health Physics Jobs are diverse and one of the most interesting and rewarding fields of scientific endeavor. Many industries,defense plants, medical facilities, and research laboratories demand professionals who understand radiation hazards and their prevention and control. Health physicist are prominent among scientists  since they are the ones who controls the beneficial use of ionizing radiation while protecting workers and the public from potential hazards. Engineering in Kenya has more articles.