Capacitance Flashcards
(24 cards)
What is capacitance?
Capacitance is the ability of a system to store an electric charge.
What is the unit of capacitance?
The unit of capacitance is the farad (F).
True or False: Capacitance depends on the voltage applied across the capacitor.
False.
Fill in the blank: The formula for capacitance (C) is C = ____ / V.
Q
What does the symbol ‘C’ represent in the context of capacitance?
C represents capacitance.
What does the symbol ‘Q’ represent in the capacitance formula?
Q represents the charge stored in the capacitor.
What does the symbol ‘V’ represent in the capacitance formula?
V represents the voltage across the capacitor.
In a parallel plate capacitor, what factors affect capacitance?
Capacitance is affected by the area of the plates and the distance between them, as well as the dielectric material.
What is the dielectric constant?
The dielectric constant is a measure of a material’s ability to store electrical energy in an electric field.
True or False: A capacitor can be charged indefinitely.
False.
What is the relationship between capacitance and plate area?
Capacitance is directly proportional to the plate area.
What is the relationship between capacitance and the distance between plates?
Capacitance is inversely proportional to the distance between the plates.
Multiple Choice: Which of the following increases capacitance? A) Increasing plate distance B) Increasing plate area C) Decreasing dielectric constant
B) Increasing plate area.
What is the effect of a dielectric material on capacitance?
A dielectric material increases capacitance by reducing the electric field between the plates.
What is the energy stored in a capacitor formula?
The energy (U) stored in a capacitor is given by U = 1/2 C V^2.
What happens to the capacitance if the dielectric material is removed?
The capacitance decreases.
What is a polarized capacitor?
A polarized capacitor is a type of capacitor that has a specific positive and negative terminal.
True or False: Capacitors can only store energy temporarily.
True.
What is the role of capacitors in electronic circuits?
Capacitors store and release electrical energy, filter signals, and smooth out voltage fluctuations.
Fill in the blank: The time constant (τ) for an RC circuit is given by τ = R × ____.
C
What is an RC circuit?
An RC circuit is an electrical circuit that consists of a resistor (R) and a capacitor (C) in series.
Multiple Choice: What happens to the voltage across a capacitor in an RC charging circuit over time? A) It remains constant B) It decreases exponentially C) It increases exponentially
C) It increases exponentially.
What is the maximum voltage a capacitor can handle called?
The maximum voltage a capacitor can handle is called the voltage rating or breakdown voltage.
What is a non-polarized capacitor?
A non-polarized capacitor can be connected in either direction in a circuit.
