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II КУРС Контрольная работа «Electromotive force» 1. Прочитайте, а затем письменно переведите 1, 2, 3 абзацы текста. Electromotive Force. 1. There must
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II КУРС
Контрольная работа
«Electromotive force»
1. Прочитайте, а затем письменно переведите 1, 2, 3 абзацы текста.
Electromotive Force.
1. There must be some driving force to cause the electrons to move through the metal conductor. This driving force tending to produce the motion of electrons through a circuit is called an electromotive force or e. m. f., for short. It is the e. m. f. that moves electrical charges from one point in the circuit to another.
2. The greater the electromotive force, the greater the pressure on the electrons moving through the conductor. However, in spite of our calling it a “force” it is not a force at all as that term is understood in mechanics.
3. A battery or other source of an electromotive force is a device that produces a potential difference necessary for causing electric current to flow along a conductor. We know the current to flow through a conductor in case there is a difference of potential between the ends of the conductor, for it is then that an e. m. f. is present.
4. One should distinguish between an electromotive force and a potential difference. A generator or a battery is a source of e. m. f., whereas the voltage across the resistance in which a current is flowing is a potential difference or voltage drop. In general, the e. m. f. of a battery or a generator cannot be measured exactly at its terminals, since these devices have an internal voltage drop when the circuits completed.
Электродвижущая сила.
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