The input power for the generator is always greater than the output power of the generator as most of the energy is lost as heat to the outside environment due to friction and resistance in the conducting wire.
Using magnets to generate electricity in wires
When you have a uniform magnetic filed produced by a magnet and you put a straight wire in such a position that the wire and the direction of motion and the magnetic filed are all at right angles to each other. The emf or voltage produced by the generators will appear at the terminals of the wires. The voltage can be calculated as the length of the wire multiplied by the magnetic field strength and the velocity of the subject in motion. There arrangement of the wires and magnets in a generator is in such a way that electricity is generated through the motion. The arrangement of the wires and shaft are in such a manner that the energy input is lower than the energy output. The electricity generated through the use of magnets has been the most economic method to generate electricity. This has made a great turnaround in the electric generating plants. Such as the wind and the hydroelectric power generation. In the hydro power station water is used to propel the shaft that is between the magnets and thereby generating the emf voltage between the end terminals.
When at any one time if a magnetic flux density is passed round a conductor an emf or voltage is produced. A generator is almost the same as a motor but it defers from the way that they are powered. The coil of the generator is very much different in that it is generated by means of external power. These generators can either be driven by wind water and steam. As the core of the generator begins to rotate between the magnets the magnetic flux cuts the wires and an emf is produced. The electricity produced by the generators is proportional to the power forcing the shaft to rotate between the magnets. Thus the more the input that brought fourth the more the electricity that can be generated at that given time. This in turn brings us to the need to have the best and adequate source of energy for the generators when producing electricity. There are quite a number of alternatives that can be used to generator electricity. The well known and best method that is used in the world to generate electricity is water. Water generated electricity is known as the hydro power. This power is normally generated using turbines that are just like generators and are propelled by the water. The water that has been put in a dam and allowed to pass through open gates is one of the best methods to produce a great deal of power to generate electricity. This is one of the cheapest and most common methods of generating electricity world over.
The fundamental substances that are behind the production of electricity using magnets are the electrons. The electrons produce an emf as they move from one energy position to another in an electrical circuit. This is one way in which electricity is produced in a circuit within a generator. The electric generation process starts when the conductor and the generator allow the electrons to start moving freely within the wires.
The basis of the generation of electricity is the simple movement of the magnet round the conductor. The conductor can be any metal that has a good effect of conducting electricity. Another way that you may be able to generate electricity is by inserting two different types of conductors into salt water. When the two different conductors are made to complete a circuit by touching the bulb terminals the light bulb shines. Well, this is a way that you can be able to generate electricity but the idea behind all these processes of generating electricity is the flow of electrons. The ability to move electrons from level to another produces the desired emf (Voltage). One thing to note in the generation of electricity using magnets is that when a moving magnetic field through a copper wire is induced an emf is produced between the terminals of the wires.
Setting up a generator to produce the electricity is very much easy and can even be done as an experimental test at home or even in the laboratory. All you need to do when setting up the apparatus is to make sure that the conductor, the copper wire and the magnetic field are at right angles to each other. Generating electricity with generators is very economical as most of the sources of energy to power the generators will never seize. These sources include; wind, water and steam.