What is the surprising thing that happens in a superconductor?

Answers

Answer 1

Answer:
With almost all substances . . .

-- when you cool them, their electrical resistance decreases.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.

-- If you keep making them colder, their resistance keeps decreasing,
but it never completely disappears, no matter how cold you make them.

But with a few surprising substances, called 'superconductors' . . .

-- when you cool them, their electrical resistance decreases.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.
-- If you make them even colder, their resistance decreases more.

-- If you keep making them colder, then suddenly, at some magic
temperature, their resistance COMPLETELY disappears. It doesn't
just become small, and it doesn't just become too small to measure.
It becomes literally totally and absolutely ZERO.

If you start a current flowing in a superconducting wire, for example,
you can connect the ends of the wire together, and the current keeps
flowing around and around in it, for months or years. As long as you
keep the loop cold enough, the current never decreases, because
the superconducting wire has totally ZERO resistance.

Did somebody say "What's this good for ? What can you do with it ?"

1). Every CT-scan machine and every MRI machine needs many
powerful magnets to do its thing. They are all electromagnets, with
coils of superconducting wire, enclosed in containers full of liquid helium.
Yes, it's complicated and expensive. But it turns out to be simpler and
cheaper than using regular electromagnets, with coils of regular plain
old copper wire, AND the big power supplies that would be needed
to keep them going.

2). Resistance in wire means that when current flows through it,
energy is lost. The long cables from the power-generating station
to your house have resistance, so energy is lost on the way from the
generating station to your house. That lost energy is energy that the
electric company can't sell, because they can't deliver it to customers.

There are plans to build superconducting cables to carry electric power
from the producers to the customers. The cables will be hollow pipes,
with liquid helium or liquid hydrogen inside to keep them cold, and
something on the outside to insulate them from the warmth outside.
Yes, they'll be complicated and expensive. But they'll have ZERO
resistance, so NO energy will be lost on its way from the generating
stations to the customers. The power companies think they can
build superconducting 'transmission lines' that will cost less than
the energy that's being lost now, with regular cables.

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The rotational speeds of four generators. are listed in RPM arrange the generators in order based on the electric fields they create. Start with the weakest electric field and end with the strongest. Assume that the generators are identical except for their speed

Answers

with the same generator, so the only factor for producing

the slectric field is only the speed. The faster the rotational speed of the

generator the greater it produce electric field. So the sequence is 3000 rpm

< 3200 rpm < 3400 rpm < 3600 rpm

Explain what wave frequency is...

Answers

Wave frequency is the number of waves that pass a fixed point in a given amount of time.

Explanation:

Wave frequency is the number of waves that pass a fixed point in a given amount of time. The SI unit for wave frequency is the hertz (Hz), where 1 hertz equals 1 wave passing a fixed point in 1 second. A higher-frequency wave has more energy than a lower-frequency wave with the same amplitude.

Volume , mass, and weight can be measured with balances, scales, and ?

Answers

If you are talking about volume, then an easy way to measured the volume of a liquid would be with a graduated cylinder. A graduated cylinder is marked with volume units such as milliliter (mL) or the liter (L). One liter equals 1 thousand milliliters.

To measure the volume of a solid you use the formula V = (Length)(Width)(Height)

To measure the volume of a gas you use a graduated cylinder held upside down. At first the cylinder is filled with water. When air is blown into the cylinder, bubbles rise and push some water down. The volume of the water pushed down is equal to the volume of the gas that was blown in.

The red sphere represents a proton. What is the atomic number of this atom

Answers

The atomic number is the number of protons of the atom.

So, just count the number of red spheres (protons) and that is the atomic number of the atom.

The protons are in the nucleus of the atom. Every single element is formed by a representative number of protons (atomic number).

For example, every hydrogen atom has one proton and its atomic number is one.

Every helium atom has two protons and its atomic number is two.

And so on. This permits you to order the elements in the periodic table in increasing atomic number.

There are no two elements with the same number of protons (atomic number) and all the atoms of a same element have the same number of protons.

The atom is apparently too small for us to see,
so we can't identify it.

What is information that is encoded as a string of 1s and 0s?

Answers

Answer: a digital signal

Explanation:

Example of natural frequency

Answers

Natural frequency is a frequency when an object hits a s surface and causes ripples or vibrations or disturbance of their nearby source. An example is throwing a stone to water. When you throw a stone, it creates a wave around the fallen stone. The water is being disturbed by the stone and creates a wave. This is a natural frequency.

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