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cremedelacreme
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A copper wire of cross sectional area 2 mm^2 carries a current of 10 A. How many electrons pass through a given cross sectional of the wire in one second?
Current Question: How Many Electrons in Copper Wire/sec?
- Thread starter cremedelacreme
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In summary, we can use the formula Current = Charge/Time to find the charge passing through a given cross sectional area of a copper wire. The unit Ampere represents the rate of flow of charge, and one electron carries a charge of 1.6 x 10^-19. By dividing the current by the charge of one electron, we can determine the number of electrons passing through the wire in one second.
- #2
Doc Al
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What's the definition of current?
- #3
cremedelacreme
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Err V= IR?
But I don't know how to relate with Area...
But I don't know how to relate with Area...
- #4
Doc Al
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Nope. That's Ohm's law. Hint: What does the unit Ampere mean? 1 A = ??cremedelacreme said:
Perhaps the area is irrelevant.
- #5
cremedelacreme
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Err
Ampere = Charge / Time
So
Charge = Ampere / Time
ooh
we find the charge
and since
one electron has a charge of 1.6 x 10^-19
thus, we divide the charge by the charge of one electron...
is it correct?
Ampere = Charge / Time
So
Charge = Ampere / Time
ooh
we find the charge
and since
one electron has a charge of 1.6 x 10^-19
thus, we divide the charge by the charge of one electron...
is it correct?
- #6
Doc Al
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Right!cremedelacreme said:
Careful: If Current = charge/time then charge = current * time.
Good!
Related to Current Question: How Many Electrons in Copper Wire/sec?
1. How many electrons flow through a copper wire per second?
On average, one ampere (A) of current represents the flow of approximately 6.24 x 10^18 electrons per second through a conductor. Therefore, the number of electrons flowing through a copper wire per second depends on the amount of current passing through it.
2. How does the number of electrons in a copper wire affect its conductivity?
The number of electrons in a copper wire does not directly affect its conductivity. Instead, it is the arrangement and mobility of these electrons that determine the wire's conductivity. Copper is a good conductor because it has a large number of free electrons that are able to move easily through the metal.
3. How does copper wire carry electricity if it is made of atoms with neutral charges?
While the atoms in a copper wire are indeed neutral, they contain negatively charged electrons that are able to move freely within the metal. When a voltage is applied, these electrons are able to flow from one end of the wire to the other, carrying electricity with them.
4. Can the number of electrons in a copper wire change?
The number of electrons in a copper wire remains constant, as the number of protons and electrons in an atom are always equal. However, the number of free electrons (also known as conduction electrons) can change depending on external factors such as temperature and applied voltage.
5. How does the number of electrons in a copper wire affect its magnetic properties?
The number of electrons in a copper wire does not have a direct effect on its magnetic properties. However, the flow of electrons through the wire can create a magnetic field, which can be strengthened or weakened by the number of turns in the wire (known as the number of loops or coils) and the amount of current flowing through it.
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