Loudspeakers work when fluctuating electric currents flow through the solenoid (coiled wire) which connects the circuit. This current which has now been created in the coil creates a magnetic field, this then interacts with the permanent magnet which attracts and repels and from there causes the cone of the speaker, also known as the diaphragm, to move back and forth. This is due to what is called induction, which then causes the cone shaped diaphragm to push air forward, causing sound waves. The magnetic field’s current reverses, causing the cone backwards, this keeps on repeating, making the cone vibrate. The vibrations in the cone shaped diaphragm of the speaker force air forward, thus causing the sound to be projected. When the sound is projected in the air, the particles are busy vibrating and causing molecules to be moved around. Sound travels in longitudinal waves where there are compressions and rarefactions.
Loudspeakers encourage socialising in a larger group. The sound (music) produced by speakers has the ability to bring people together, as it allows all to enjoy music without anyone being excluded. This is quite the opposite to headphones, which only allow 2 people at the max to listen to music. Speakers have a huge price range, as a direct result of the quality, making it accessible to most people. Speakers are generally quite safe but there have been a few cases when airlines have declined people’s rights to bring them aboard, due to possible safety problems. This has got to do with the speaker magnets and a handful of airlines are concerned with the effects it can cause, such as fires, explosions and even interferences with the navigation systems and communication systems in the plane. For speakers allowed to be taken on board, most airlines require it to be labelled and clearly marked as a magnetic material. Some deliveries of speakers are overly packaged with wrapping and tape, as so to abide by specific requirements for different airlines and services.
The environmental impact that the production of loudspeakers has can be quite damaging. Strontium ferrite can be used as part of the magnetic material. It is proven to be higher in magnetic energy, as compared to other ceramic materials often used. Strontium ferrite is a new inexpensive type of permanent magnet material, which can have quite detrimental effects on the environment when not disposed of properly. Strontium 90 and other radioactive strontium can be quite damaging to our health. Strontium 90 is a radioactive by-product of nuclear fission. It can be found in foods, such as milk and cheese, it is also evident in water. Strontium decays release heat which can interfere with the levels of radioactive waste. RadioactiveEV says that “when a vitrified waste package is produced at the La Hague plant, a quarter of the heat released – 500 watts – is due to strontium decay.” Strontium pollutes the water and it is said by the Agency for Toxic Substances & Disease Registry that there is “less than 1 milligram for every litre of water (1mg/L).” The pollution of strontium 90 comes from the dust in the air. The radioactive isotope of strontium, which is a by-product of human’s involvement due to the testing of nuclear power. This can then be released into the environment, this can then go on to pollute the water.
The development of electricity has benefitted our lives in numerous ways and most definitely improved the quality of our everyday lives. Electricity allows us to keep warm, have light and to develop new technologies. Almost everything requires electricity to run and so due to the development of it we are now able to create new opportunities and new discoveries into the world. Electricity has allowed for manufacturing, being one of the new opportunities, which has then gone on to create many more jobs. It has not only made life easier for everyone but has also brought people together, speakers as an example.
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