How to figure out max voltage from resistance of the material between two plates

In summary, the conversation discusses finding the maximum voltage of a capacitor using the distance between the plates, the area of the plates, and the resistance of the material between the plates. However, it is mentioned that the key factor is actually the dielectric strength of the material, not its resistance. This is typically measured as breakdown voltage per unit thickness.
  • #1
TWest
48
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Okay guys, I have a question and I am sure the answer is stupidly obvious but I can't seem to find a equation explaining it. I want to know the max possible voltage of the capacitor based on the distance between the plates, the Area of the plates, and the resistance of the material between the plates in ohms. if it helps the figures I was looking at were dx = .35 (m) A = .5 (m) radius and the resistance of the material between the plates is 1 * 10^11 (ohms) Which gives this material a volume of .27 (m^3)
 
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  • #2
What you need to know is the dielectric strength of the material, not its resistance. This is given as breakdown voltage / thickness, so for example polythene might be 20-160MV/m.

PS. You might want to check your calculation of volume, not that it is relevant!
 

Related to How to figure out max voltage from resistance of the material between two plates

1. How does the resistance of the material affect the maximum voltage between two plates?

The resistance of the material plays a crucial role in determining the maximum voltage that can be applied between two plates. As the resistance increases, the maximum voltage decreases, and vice versa. This is because high resistance materials restrict the flow of electric current, making it harder for a higher voltage to pass through.

2. Can the distance between the plates affect the maximum voltage between them?

Yes, the distance between the plates also plays a significant role in determining the maximum voltage that can be applied. The closer the plates are, the higher the electric field strength, and therefore, a higher voltage can be applied before the material between the plates breaks down.

3. Is there a formula to calculate the maximum voltage based on the resistance and distance between the plates?

Yes, there is a formula to calculate the maximum voltage between two plates based on the resistance and distance between them. It is known as the Paschen's Law, which states that the maximum voltage is directly proportional to the product of the distance between the plates and the natural logarithm of the resistance.

4. Can the material's properties, such as conductivity, affect the maximum voltage between two plates?

Yes, the material's properties, such as conductivity, can also have an impact on the maximum voltage between two plates. Conductive materials have lower resistance, allowing for a higher voltage to be applied before breakdown. On the other hand, insulating materials have higher resistance, limiting the maximum voltage that can be applied between the plates.

5. What happens if the maximum voltage is exceeded between two plates?

If the maximum voltage is exceeded between two plates, the material between them will break down, allowing electric current to flow through. This breakdown can result in damage to the material, and in extreme cases, it can also cause electrical fires or explosions. Therefore, it is crucial to calculate and adhere to the maximum voltage limit to avoid potential hazards.

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