The condenser is called the device capable to accumulate electric charges. The amount of the accumulated electric energy in the condenser is characterized by its capacity. It is measured in farads. It is considered that capacity in one farad corresponds to the condenser charged with electric charge in one pendant at potential difference on its facings in one volt.
Instruction
1. Determine the capacity of the flat condenser by formula C = by S · e • e0/d where S is the surface area of one plate, d - distance between plates, e - relative dielectric permeability of the environment filling space between plates (it is equal in a vacuum to unit), e0 - the electric constant equal to 8,854187817•10 (-12) F/m. Proceeding from the given formula, the size of capacity will depend on the area of conductors, on distance between them and on dielectric material. As dielectric paper or mica can be applied.
2. Determine relative permeability of dielectrics by special tables. For paper its size will be 3.5, for mica - 6.8-7.2, for porcelain - 6.5. This figure shows how much force of interaction between charges in this environment is less, than in a vacuum.
3. Calculate the capacity of the spherical condenser on formula C = (4P·e0·R²) / d where P - number "пи", R - the radius of the sphere, d - gap size between its spheres. The size of capacity of the spherical condenser is directly proportional to the radius of the concentric sphere and is inversely proportional to distance between spheres.
4. Calculate the capacity of the cylindrical condenser by formula C = (2P·e · e0 ·L · R1) / (R2-R1) where L - condenser length, P - number "пи", R1 and R2 - radiuses of its cylindrical facings.
5. If condensers in a chain are connected in parallel, calculate their general capacity by formula C = C1+C2+ … + Cn where C1, C2, … Cn – tanks in parallel the connected condensers.
6. Calculate the general capacity of consistently connected condensers on formula 1/C = 1/C1+1/C2+ … +1/Cn where C1, C2, … Cn - tanks of consistently connected condensers.