dear Bettina, the fact that the power lines as the one that has the wires close to your house there are "tensions" (but the correct term is the potential difference and denoted by V) very high order of hundreds of thousands of volts is due to the fact that an electrical current along a wire, the wire has a nasty (in this case but not in an electric heater) used to generate heat that is dispersed into the surrounding environment and this -in respect of the fundamental principles underlying physics, said " principle of conservation of energy" -produce a drop of difference di potenziale e perdita di energia per irradiazione di calore. Quindi non tutta la quantità di energia elettrica che l’Enel invia giunge nelle abitazioni ed in altri luoghi.
Se non credi a questo fatto,prendi un tester e misura la tensione (ormai chiamiamola così) fra i due poli della batteria e vedrai che essa è un po’ oltre i convenzionali 12 volt ma poi se vai a misurarla lontano ,ad una certa distanza dalla batteria,fra l’estremo di un filo che giunge alla luce della targa ed un punto qualsiasi della carrozzeria non coperto da vernice (forse devi aprire il baule posteriore ),vedrai che la tensione è scesa e di molto,può anche essere di circa 10 volt).
now because, as you have studied, in a power supply for the product of the intensity is constant and is called power (W) of the current, we have that (V x I) = W, if one of the two factors increases or decreases, the other must decrease or increase respectively.
For Mom Enel would reduce the energy loss along the wire to reduce the intensity I, which, appearing at the second high power is felt more than other variables such as time t and the resistance R. So what does it do? It takes a huge transformer and the voltage rises dramatically and with this device greatly reduces the intensity greatly reducing the amount of waste heat on the street in accordance with the principle of Joule.
course just before the power comes into our house, Mom Enel has with other processors to bring "human" values, that is decently low, the tension in the house to avoid sending the electric chair.
's why currents such as those that pass close to your house in the country have very high voltages. You say that these high voltages create disorder and on this I do not know what to tell you precisely, it is a bit 'as the history of the mobile phone is dangerous or not? Many say yes, but there is no single test that has seriously dimostrato.Certamente in areas surrounding the wire there are powerful electric fields cylindrical in shape and large width where the wire is the right axis of the cylinder.
then I ask because your Smart and cars generally need the starter.
But it's the same principle that requires cigarette to light the match.
A physical system has a certain amount of potential energy, "the ability" to do that alone and not go it alone, is in equilibrium and if someone does not sleep quietly sveglia.Svegliarlo called "introduction energy in the system "and is to spend energy to avviare.La cigarette lighter needs el'accendino needs of the work done by the finger on a particular mineral emettte sparks when rubbed, the finger steals a bit 'of energy to you that once you take your food.
in your tricilindrica If it were not for the starter motor and battery that powers it, you should introduce energy into the "engine of the Smart system" with other methods, such as foot pedals or other for starting the engine.
If you put the spaghetti into the water without turning on the gas this chef (their way) but also by subtracting ambient heat to the water it would take, I think, days, regardless that a number of enzymes and bacteria which is likely to intervene all rot.
Then you light the stove and introduce energy into the "spaghetti-water system" giving way to the complex of physical-chemical reactions which is called the speed of cooking time depends on temperature.
If a tile on the roof, it is in a state of equilibrium due to the roof (binding reaction of the plan) and can fall only if someone helps in this direction by introducing energy (that you push or a wind that blows over with strength but you should spend your energy body to move and / or the wind should reduce its speed to expend energy.
Energy someone has to pay.
How much? be calculated in individual cases, but in your house tells you the counter.
beast power when you need to buy in person, unlike the case in which, fortunate, somebody has to pay the regala.Ma someone!
stop the Smart When braking, the kinetic energy of the beast is transformed into thermal energy (heat) at the level of brake temperatures ranging from about 400 ° C of the well-Smart above 1000 ° C of the cars of "formula international travel" (f1, f2, f3) and this energy is transformed into heat and is lost in the system "world" you have already paid to the distributor station. You know that energy never disappears but is converted in other ways (those who have discovered is finished guillotined! Lavoisier.).
In this case there has been a transformation of type termodinamico.Sai also know that if you travel but will not speed up speed as constant as possible reduces the amount of kinetic energy of the car si trasforma in calore a livello dei dischi dei freni e che deve essere poi rimpiazzata a spese del serbatoio di benzina.In questo senso,ad una determinata velocità e con un determinato carico (ma nel problema insistono altre variabili) la guida in città,con frenate frequenti,costa di più.
Ed ora una cosa triste dal punto di vista economico:
le trasformazioni termodinamiche non sono reversibili (o meglio,per la Fisica Quantistica, è estremamente improbabile che lo siano) e quindi quando freni ,tutto considerato,trasformi la benzina in calore sui dischi dei freni .
Ma sarà ben difficult for cooling the brakes with the ice returns in the petrol tank.
To do so would take the intervention of the "Main" the only one who can do miracles!
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