Реостат сделан из никелиновой проволоки с удельным сопротивлением 0,4 • 10^-6 Ом • м, длиной 15 м и площадью поперечного сечения 1 мм2. Найти силу тока в цепи, если напряжение на зажимах реостата равно 18 В.

Реостат сделан из никелиновой проволоки с удельным сопротивлением 0,4 • 10^-6 Ом • м, длиной 15 м и площадью поперечного сечения 1 мм2. Найти силу тока в цепи, если напряжение на зажимах реостата равно 18 В.
- Предмет:
  Физика
- Автор:
  patriciapham
- 5 лет назад

Ответы 1

I = U / R U - напряжение ( 18 В ) R - сопротивление R = p * L / S p - удельное электрическое сопротивление ( 0,0000004 Ом * мм² / м ) L - длина провода ( 15 м ) S - площадь ( 1 мм² ) R = 0,0000004 * 15 / 1 = 0,000006 / 1 = 0,000006 Ом I = U / R = 18 / 0,000006 = 3000000 А = 3 МА
- Автор:
  laurelbjyb
- 1 год назад
- 3
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Read the text. Are the statements true (T) or false (F)?

The Dakar Rally

You’ve probably heard of the off-road motor vehicle rally called the Dakar Rally, but do you know where is finishes? Before you say Dakar, the capital of Senegal, think again! The last time the rally finished in Dakar itself was in 2007. In 2008, because of concerns about security, the rally was cancelled and a shorter, less challenging race called the Central Europe Rally was held in its place. And since 2009, the Dakar Rally has been held in South America due to the increasing risk of terrorism in Senegal.
The first Dakar Rally was held in 1978. During a race in 1977, a French competitor, Thierry Sabine, had got lost on his motorcycle in the Libyan desert. Having been rescued, he returned to France convinced that the desert landscape would provide a fantastic challenge for an international competition. The Dakar Rally began the next year, and for the next fifteen years, hundreds of drivers and motorcyclists competed in the annual long-distance race. Competitors would drive from Paris to the Mediterranean, then across the north-western corner of Africa to the Senegalese capital, trying to avoid getting lost in the desert sandstorms. Then things became complicated: the region became more and more politically unstable, and officials have had to change the starting point, rally route and finishing line of the race nearly every year since 1994.
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