Leakage Current Explained: What V, R, A, ρ, and d Stand For

In summary, Ohm's law states that the current flowing through a resistor is proportional to the voltage applied and inversely proportional to the distance between the resistor and the source of the voltage.
  • #1
gracy
2,486
83
If the dielectric breakdown occurs in a parallel plate capacitor ,then leakage current is
##I##=##\frac{V}{R}##=##\frac{VA}{ρd}##
I want to know what does each stand for?
I=Current
V=Voltage or volume
R=radius or resistance
A=area of the plate
ρ=density
d=Distance between the plates
Am I correct?
 
Physics news on Phys.org
  • #2
The correct meaning is given in whichever textbook you are reading. V is not the volume, R is not the radius, and ρ is not the density. What made you feel that V is the volume, for example?
 
  • #3
Chandra Prayaga said:
The correct meaning is given in whichever textbook you are reading
No.
 
  • #4
If you know please tell me.
 
  • #5
Chandra Prayaga said:
What made you feel that V is the volume, for example?
I just guessed.
 
  • #6
I should get hold of another textbook, if I were you. Every decent textbook defines the variables in its equations. Look at the back of the book for a list of symbols used. A letter is just a letter until it has been defined.
 
  • #7
You may need to look back many pages to find the definition of each term, but they must be defined by the author writing the equation.
 
  • #8
DaleSpam said:
You may need to look back many pages
Sometimes, it's a lot less trouble to ask PF. (?) :wink:
 
  • Like
Likes davenn
  • #9
But I have found this in a google book.And there is no definition in back pages.
 
  • #10
The first part is just Ohm's law. Check it out. Did you learn about it?
In the second part the resistance is expressed in terms of the parameters of the resistor.
 
  • #11
gracy said:
But I have found this in a google book.And there is no definition in back pages.
Then this book is not a good source for learning this material. You should not have to ask this type of question. The real problem to address here is the textbook you are using, not the specific formulas.

I am closing this thread. Please go to the textbook forum ( https://www.physicsforums.com/forums/science-and-math-textbooks.21/ ) and open a new thread or search for an old one with advice on a better resource.
 

1. What is leakage current?

Leakage current is the small amount of electric current that flows through an insulating material, such as a wire or a semiconductor, even when there is no external voltage applied. It is a result of imperfections in the material that allow electrons to flow, and can be measured in terms of voltage, resistance, current density, and distance.

2. What do the symbols V, R, A, ρ, and d represent in leakage current?

V represents voltage, R represents resistance, A represents current density, ρ (rho) represents resistivity, and d represents distance. These symbols are used to measure and calculate the amount of leakage current in a material.

3. How is leakage current related to insulation?

Leakage current is an important factor in determining the quality of insulation in a material. A higher leakage current indicates that the material has more imperfections and is therefore less effective at insulating against electric current. Lower leakage current is desirable for safe and efficient electrical systems.

4. What causes leakage current?

Leakage current is caused by imperfections in the material, such as impurities or defects, which allow electrons to flow through the material. These imperfections can be natural or introduced during manufacturing processes. Temperature, humidity, and voltage can also affect the amount of leakage current in a material.

5. How can leakage current be reduced?

Leakage current can be reduced by using high-quality materials with fewer imperfections, controlling temperature and humidity levels, and properly designing and manufacturing electrical systems. Regular maintenance and testing can also help identify and address any potential sources of leakage current.

Similar threads

I On the derivation of Child-Langmuir law
    • Electromagnetism
Replies
6
Views
1K
How does corona discharge create leakage current?
    • Electrical Engineering
Replies
5
Views
909
B Ion Trap and Time-Varying Potentials
    • Electromagnetism
Replies
1
Views
721
Prove to me how capacitors in parallel can have the same V across plates
    • Electromagnetism
Replies
7
Views
1K
B field between the plates of a charging capacitor (Ampere's law)
    • Electromagnetism
Replies
2
Views
1K
Max surface charge of a conductive plate
    • Electromagnetism
Replies
8
Views
916
Confusion when dealing with loops and surfaces with Maxwell equations
    • Electromagnetism
Replies
2
Views
617
I How to use geometrical symmetries -- general advice? (Vector potential)
    • Electromagnetism
Replies
2
Views
303
Electric field in a capacitor with multiple dielectrics
    • Electromagnetism
Replies
2
Views
3K
Magnetic field due to displacement current and Ampere's law
    • Electromagnetism
Replies
1
Views
4K

Hot Threads

Recent Insights

Back
Top