what is accerating potential?
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Accelerating potential is V,then velocity (u) acquired by the charge particle having charge Q and mass m.
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There is no such thing as accelerating potential.
Let me explain with a simple example.
A ball accelerates down a hill because there is a difference in potential between the top and bottom of the hill.
We can't just talk about potential on its own because there might not be any difference in potential. Two points on a horizontal road have the same potential so the ball will not accelerate from one point to the other.
So we have to talk about: Accelerating potential difference.
Here are two examples
1. Gravity fields
A mass that is free to move will accelerate from a point of high gravitational potential to a point of lower gravitational potential.
So a ball will accelerate to the bottom of a hole because the gravitational potential at the top of the hole is larger than the gravitational potential at the bottom of the hole.
We say there is a gravitational potential difference between the top and bottom of the hole.
We measure gravitational potential difference, V, in joules per kilogramme.
Let's pretend that there are two points, A and B, in a vacuum.
POINT A >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>POINT B
V = - 20 J/kg ................................................................................ V = - 30 J/kg
The potential difference between A and B is 10 J/kg.
This means that a one kilogram mass will accelerate from A to B and gain 10 joules of kinetic energy.
2. Electric fields
A charge will accelerate between two points if there is a difference in electric potential between the points.
We measure electric potential difference, V, in joules per coulomb.
A joule per coulomb is also called a volt.
Let's pretend that there are two points, A and B, in a vacuum.
POINT A >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>POINT B
V = 15 J/C ...................................................................................... V = 5 J/C
V = 15 V ..........................................................................................V = 5 V
The potential difference between A and B is 10 joules per coulomb (or !0 volts).
This means that a one coulomb charge will gain 10 joules of kinetic energy as it accelerates from A to B.
We often say the potential difference between A and B is 10 volts.
In everyday language this ‘potential difference’ is called ‘voltage’.
To answer the point made in your comment. A charge, such as an electron, will accelerate between two points if there is a potential difference between the points. You could then work out the final speed, v, of the electron - and then its wavelength, which is equal to h / (m v).
Let me explain with a simple example.
A ball accelerates down a hill because there is a difference in potential between the top and bottom of the hill.
We can't just talk about potential on its own because there might not be any difference in potential. Two points on a horizontal road have the same potential so the ball will not accelerate from one point to the other.
So we have to talk about: Accelerating potential difference.
Here are two examples
1. Gravity fields
A mass that is free to move will accelerate from a point of high gravitational potential to a point of lower gravitational potential.
So a ball will accelerate to the bottom of a hole because the gravitational potential at the top of the hole is larger than the gravitational potential at the bottom of the hole.
We say there is a gravitational potential difference between the top and bottom of the hole.
We measure gravitational potential difference, V, in joules per kilogramme.
Let's pretend that there are two points, A and B, in a vacuum.
POINT A >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>POINT B
V = - 20 J/kg ................................................................................ V = - 30 J/kg
The potential difference between A and B is 10 J/kg.
This means that a one kilogram mass will accelerate from A to B and gain 10 joules of kinetic energy.
2. Electric fields
A charge will accelerate between two points if there is a difference in electric potential between the points.
We measure electric potential difference, V, in joules per coulomb.
A joule per coulomb is also called a volt.
Let's pretend that there are two points, A and B, in a vacuum.
POINT A >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>POINT B
V = 15 J/C ...................................................................................... V = 5 J/C
V = 15 V ..........................................................................................V = 5 V
The potential difference between A and B is 10 joules per coulomb (or !0 volts).
This means that a one coulomb charge will gain 10 joules of kinetic energy as it accelerates from A to B.
We often say the potential difference between A and B is 10 volts.
In everyday language this ‘potential difference’ is called ‘voltage’.
To answer the point made in your comment. A charge, such as an electron, will accelerate between two points if there is a potential difference between the points. You could then work out the final speed, v, of the electron - and then its wavelength, which is equal to h / (m v).
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