A generator works by a magnetic field inducing a voltage into a coil of wire. Important points to note are that the voltage increases as the number of turns of wire on the coil becomes larger and the size of the coil and the strength of the magnetic field increase. The magnetic field (or the coil) needs to be in constant motion to produce/induce the electricity into the coil. This can be done by moving the magnet or by moving the coil – the effect is the same. The coil (or the magnet) needs to move in such a way that the coil continually passes through the magnetic field.
Chapter III: Methodology Maybe we think that there’s no any problem. But your wrong there is a problem regarding this study. It will take a long time to know it. Must understand the relationship between why the magnet, coil and wire through the bulb connected that produces electricity? In what way these studies generate electricity or power without using any electricity? What are the advantages does this study as part of our living in modern days? Does these study help more to improve the things that are happening in our days regarding the upgrading of technologies nowadays.
This experiment was done to investigate the relationship between the number of turns in a coil and the voltage induced in it by a moving magnet. The coil that has many turns will have the highest voltage. Thus, the greater the number the turns, the higher the voltage. Electromagnetic induction occurs when a current is induced in a coil by a changing magnetic field. When either the magnetmoves in relation to the coil or the coil moves in relation to the magnet, a current will be induced in the coil.
However if there is no relative movement between the coil and the magnet, there will not be any current induced in the coil. If an electric current flows through a wire, then a magnetic field will be produced around the wire. The magnitude of the field depends on the magnitude of the current through the wire. If the wire is wrapped into a loop, the field near the center of the loop is perpendicular to the plane of the loop. When the wire is looped a number of times to form a coil, the magnetic field at the center increases. Static electricity is an electric charge built up on persons or objects through friction.
It is most familiar as an occasional annoyance in seasons of low humidity, but can be destructive and harmful in some situations. When working in direct contact with integrated circuit electronics, or in the presence of flammable gas, care must take to avoid accumulating and discharging static electricity. It does not flow in a current. Static electricity generated by rubbing two nonmagnetic objects together. The friction between the two objects generates attraction because the substance with an excess of electrons transfers them to the positively-charged substance.
Usually substances that don’t conduct current electricity (insulators) are good at holding a charge. These substances may include rubber, plastic, glass or pitch. The electrons that are transferred are stored on the surface of an object. Both our natural and our artificial environments generate electric and magnetic forces of various magnitudes—in the outdoors, in offices, in households and in industrial workplaces. This raises two important questions: (1) do these exposures pose any adverse human health effects, and (2) what limits can be set in an attempt to define “safe” limits of such exposures?
This discussion focuses on static electric and magnetic fields. Studies are described on workers in various industries, and also on animals, which fail to demonstrate any clear-cut adverse biological effects at the levels of exposure to electric and magnetic fields usually encountered. Nevertheless, attempts are made to discuss the efforts of a number of international organizations to set guidelines to protect workers and others from any possible dangerous level of exposure.
When a voltage or electric current is applied to an object such as an electrical conductor, the conductor becomes charged and forces start to act on other charges in the vicinity. Two types of forces may be distinguished: those arising from stationary electric charges, known as the electrostatic force, and those appearing only when charges are moving (as in an electric current in a conductor), known as the magnetic force. To describe the existence and spatial distribution of these forces, physicists and mathematicians have created the concept of field.
One thus speaks of a field of force, or simply, electric and magnetic fields. The term static describes a situation where all charges are fixed in space, or move as a steady flow. As a result, both charges and current densities are constant in time. In the case of fixed charges, we have an electric field whose strength at any point in space depends on the value and geometry of all the charges. In the case of steady current in a circuit, we have both an electric and a magnetic field constant in time (static fields), since the charge density at any point of the circuit does not vary.
Electricity and magnetism are distinct phenomena as long as charges and current are static; any interconnection between electric and magnetic fields disappears in this static situation and thus they can be treated separately (unlike the situation in time-varying fields). Static electric and magnetic fields are clearly characterized by steady, time-independent strengths and correspond to the zero-frequency limit of the extremely low frequency (ELF) band.