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Electromagnetism Essay

1118 words - 5 pages

A) A guitar pickup consists of a permanent magnet (usually with a material core such as ceramic or alnico) which is wrapped by a tight copper coil of many turns (several thousands). The pickups are mounted onto the body of the guitar below the strings which make contact.
B) Pickups convert the mechanical energy of the vibrating strings into electrical energy through electromagnetic induction. The permanent magnet of the pickup creates a steady magnetic field that changes as the strings vibrate. The coil wrapped within the magnetic field is induced with a current and voltage as said magnetic field alternates due to the vibrating strings. The output is an alternating current since the voltage ...view middle of the document...

This is useful for electric guitars since precisely controlling the flow of electrons through the amplifier can drastically increase sound strength and quality. A cathode tube contains billions of electrons that are held in place and only released when the electrical signal from the guitar flows through the tube. The released electrons flow freely to the positive terminal (anode) in huge but controlled bursts. The tiny voltages that come from the guitar release a fierce storm of electrons inside the amplifier, which increases the electrical signal that comes through it.
F) A common speaker consists of a frame where a permanent magnet and an electromagnet are held in place. Both are positioned so that the electromagnet is directly above the permanent magnet. Above the electromagnet is attached a diaphragm which creates the sound waves as it vibrates. The alternating electric current that comes from the amplifier flows through the electromagnet which naturally causes its polar orientation to switch accordingly with the current. The permanent magnet that is below has a fixed polar orientation, so the electromagnetic will find it being constantly attracted and repelled in respect to its own alternation in polar orientation. Since the diaphragm is attached to the electromagnet, it will move up and down as well. This vibration of the diaphragm creates sound waves.

Question #2
An electrical generator consists of coils of wire tightly wound onto a metal core (Armature). The coils are adhered to a shaft that can rotate freely and is positioned inside a permanent magnet. The shaft is rotated at very high speeds mechanically through a turbine. As the coils rotate, the fixed magnetic field interacts with its electrons, which produces a flow of electricity. This flow is AC since the voltage induced alternates between positive and negative in a sine fashion.
B) All of these power plants have in common that they rely on spinning a turbine’s blades rapidly to mechanically spin a shaft attached to an electrical generator. Coal, natural gas, and oil power plants burn their respective fuels to boil water and generate steam. The heated and pressurized steam spins the turbine’s blades. Nuclear power plants are similar except that the heat used to boil the water comes from the fission chain reaction of splitting nuclei. Wind...

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