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Paraphin [41]
3 years ago
13

To lower the voltage from a "120 V" outlet, what is used (first, at least) in most situations

Physics
1 answer:
nasty-shy [4]3 years ago
4 0

Answer:

B. Transformer

Explanation:

A transformer is a device that is used to either raise or lower voltages and currents in an electrical circuit. In modern electrical distribution systems, transformers are used to boost voltage levels so as to decrease line losses during transmission. It basically trades voltage for current in a circuit, while not affecting the total electrical power. This means it takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice versa.

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A) For this exercise we must use the expression of Faraday's law for a moving body

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            fem = - \frac{d (B l y}{dt}= - B l v- d (B l y) / dt = - B lv

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we calculate

             B = - 7.9 10⁻⁴ /(0.73 20)

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the thumb points in the direction of the rod movement to the south, the magnetic field points in the horizontal direction and the rod is in the east-west direction.

Therefore the force points in the direction perpendicular to the velocity and the magnetic field is in the east direction; therefore the positive side of the bar is to the West

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