Electricity and magnetism – electric power explained o gosh corpus christi


Electricity is a form of energy that is transmitted through copper conductor wire to give power to the operation of electrical machines and devices such as industrial, commercial, institutional and residential lighting, electric motors, electrical transformers, communications networks, home appliances, electronics, etc.

When charged particles flow through the conductor, we call it "current electricity". This is because when the charged particles flow through wires, electricity also flows. We know that current means the flow of anything in a particular direction. For example, the flow of water. In the similar way, the flow of electricity in a certain direction is called current electricity or electric current.

Magnetism is a type of attractive or repulsive force that acts up to certain distance. The distance up to which this attractive or repulsive force acts is called a "magnetic field". Magnetism is caused by the moving electric charges (especially electrons). When two magnetic materials are placed close to each other, they experience an attractive or repulsive force.

In 1820, Hans Christian Orsted observed a surprising thing, when he switched on the battery from which the electric current is flowing, the compass needle moved away from the point north. After this experiment, he concluded that, the electric current flowing through the wire produces a magnetic field.

Electricity and magnetism are related closely to each other. The electric current flowing through the wire produces a circular magnetic field outside the wire. The direction (clockwise or counter-clock wise) of this magnetic field is depends on the direction of the electric current.

Electricity and magnetism is an interesting aspect of electricity sciences. We are familiar with in our everyday lives with the phenomenon of static cling – when two objects, such as a piece of Saran wrap and a wool sweater, are rubbed together, they cling.

One feature of this that we don’t encounter too often is static "repulsion" – if each piece of Saran wrap is rubbed on the wool sweater, then the pieces of Saran wrap will repel when brought near each other. These phenomena are interpreted in terms of the objects acquiring an electric charge, which has the following features:

A convenient concept for describing these electric current and magnetic current forces is that of electric fields currents. Imagine that we have a fixed distribution of charges, such as on the plate below, and bring in the vicinity of this distribution a test charge Q.

The electric field is a property of this fixed charge distribution; the force on a different charge Q’ at the same point would be given by the product of the charge Q’ and the same electric field. Note that the electric field at Q is always in the same direction as the electric force.

An electricity and magnetism phenomenon apparently unrelated to power are electrical magnetic fields. We are familiar with these forces through the interaction of compasses with the earth’s magnetic field, or through fridge magnets or magnets on children’s toys. Magnetic forces are explained in terms very similar to those used for electric forces:

One basic feature is that, in the vicinity of a magnetic field, a moving charge will experience a force. Interestingly, the force on the charged particle is always perpendicular to the direction it is moving. Thus magnetic forces cause charged particles to change their direction of motion, but they do not change the speed of the particle.

Another way to understand these electricity and magnetism forces is to realize that if the force is perpendicular to the motion, then no work is done. Hence these forces do no work on charged particles and cannot increase their kinetic energy.

If a charged particle moves through a constant magnetic field, its speed stays the same, but its direction is constantly changing. A device in which this property is used is the mass spectrometer, which is used to identify elements. A basic mass spectrometer is pictured below.

In this device a beam of charged particles ( ions) enter a region of a magnetic field, where they experience a force and are bent in a circular path. The amount of bending depends on the mass (and charge) of the particle, and by measuring this amount one can infer they type of particle that is present by comparing to the bending of known elements.

A connection was discovered (accidentally) by Orsted over 100 years ago, who noticed that a compass needle is deflected when brought into the vicinity of a current carrying wire. Thus, currents induce in their vicinity magnetic fields. An electromagnet is simply a coil of wires which, when a current is passed through, generate a magnetic field, as below.

Another example of electricity and magnetism at work is in an atom, since an electron is a charge which moves about the nucleus, in effect it forms a current loop, and hence a magnetic field may be associated with an individual atom. It is this basic property which is believed to be the origin of the magnetic properties of various types of materials found in nature.