Name: 電池と電磁気 (貨幣の言語: 7/16) (The Battery & Electromagnetism (Language of Coins: 7/16))
Uploaded: 2021-01-14T04:33:32.000Z
Duration: 6 min 26 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

You have two pieces of metal -- copper and zinc --

And you then submerge the metals in an electrolyte --

If you then connect the two wires holding the metals,

Tiny bubbles begin to form around the copper terminal!

It seems as though something is being pulled from the zinc,

allowing a reaction  to occur on the copper side.

And it turns out this is a flow of electrical charge,

as electrons are pulled away from the zinc

or electrical pressure between the two metals --

as compared to the instantaneous discharge observed

Alessandro Volta had been investigating this effect.

By 1800, he simplified things even further,

which provided more electrolyte than was actually needed.

"[using] a few dozens of small round disks of copper

I prepare circular pieces of spongy matter

"I continue coupling a plate of copper with one [of[ zinc,

and interpose between each of these couples

This continues until I have a column as high as possible,

This is known, famously, as the "voltaic pile" --

a continuous flow of electrical charge -- or current.

And "electrical pressure" was an early term

for what we now call "voltage" -- after Volta.

If the two leads of a voltaic pile were brought into direct contact,

At first, the utility of electric current

One idea was to use the presence of bubbles

though it involved 26 difference circuits -- one for each letter.

It was based on the fact that the battery providing the current

It was found that if we simply pass  wire near a compass,

as soon as the wire made contact with the battery,

the needle jumped -- without any physical contact!

to figure out the direction of this field.

First, we assumed it to be pointing along the wire with the current,

or outwards from the wire as heat would travel.

Eventually, it was determined that it must travel around the wire --

So a loop of wire would create a magnetic field

which points through the center of the loop,

which was designed to detect and measure electric current.

It was simply a coil of wire with a compass needle in the center.

When electric current was applied the  magnetic field,

perpendicular to the direction of the force,

which was balanced on either side of the needle.

the stronger the deflection of the needle.

By 1824, William Sturgeon demonstrated a way

to increase the strength of this field even more.

Simply by wrapping a coil of wire around a piece of iron,

such as a nail, the magnetic force could be amplified.

for supporting the formation of magnetic fields --

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電池と電磁気 (貨幣の言語: 7/16) (The Battery & Electromagnetism (Language of Coins: 7/16))

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