3.9 Capacitors Flashcards
A charged capacitor is said to?
Block DC current flow.
What is the unit for capacitance?
the Farad = F
The capacitor is said to pass?
Pass AC
A charge of one coulomb exists on a capacitor when?
6.25 x 10 to the powe of 18 electrons are moved from one plate to the other.
What factors effect a capacitor area of the capacitor plate
What factors effect a capacitor?
Area of the capacitor plates, Distance between the capacitor plates, Dielectric material between the capacitor plates.
What happens when the total area of the plates increases?
Capacitance increases, the greater area can hold a greater charge.
What happens to the capacitance if the plate area is decreased?
Capacitance decreases
How else can you increase the surface area of capacitor plates?
By layering the plates using both sides.
What happens to the capacitance if the plate distance between them is altered?
Closer they are = more capacitance, further they are apart = less capacitance
What is the purpose of the diaelectric material.
Transmitting the electric force from one plate to the other. it is a good support of electrostatic fields.
Define diaelectric constant,
Defines the ability of the material to improve the capacity of the capacitor
An increase in plate are and the diaelectric constant will result in?
Increase in capacitcance.
If the diaelectric material is increased but the plates stay the same what happens?
the distance between the plates increase but the plate material doesn’t causing a capacitance decrease.
Define working voltage
Working voltage is the maximum DC voltage that can be applied to a capacitor before the dieelectric material is damaged causing the capacitor to be U/S
