CH 6_BOOK_CAPACITORS AND INDUCTORS Flashcards
Inductors in series and parallel are combined in the same way as?
Resistors
A capacitor consists of two conducting plates separated by an?
Insulator (or dielectric)
What is the formula for charge (q) in terms of capacitance?
What is capacitance?
1 Farad is equal to?
Capacitance is the amount of charge stored per plate for a unit voltage difference in a capacitor.
1 farad = 1 coulomb/volt.
What is the formula for capacitance?
A is the surface area of each plate, d is the distance between the plates, and ϵ is the permittivity of the dielectric material between the plates.
For a capacitor to carry current, its voltage must vary with time. Hence, for constant (DC) voltage, the current is?
Zero.
For a capacitor, what is the formula for current?
For a capacitor, what is the formula for voltage?
What is the formula for the instantaneous power delivered to a capacitor?
What is the formula for the energy stored in a capacitor?
In DC conditions, a capacitor is a(n) __________ circuit.
Open
Does the ideal capacitor dissipate energy?
The ideal capacitor does not dissipate energy. It takes power from the circuit when storing energy in its field and returns previously stored energy when delivering power to the circuit.
For capacitors in parallel, what is the formula for equivalent current?
For capacitors in parallel, what is the formula for equivalent capacitance?
For capacitors in series, what is the formula for equivalent voltage?
For capacitors in series, what is the formula for equivalent capacitance?
What is an inductor? What does it consist of?
An inductor is a passive element designed to store energy in its magnetic field.
It consists of a coil of conducting wire.
For an inductor, what is the formula for voltage?
For an inductor to have voltage across its terminals, its current must vary with time. Hence, for constant current through the inductor, the voltage is?
Zero.
What is inductance?
Inductance is the property whereby an inductor exhibits opposition to the change of current flowing through it, measured in henrys (H).
What is the formula for inductance?
N is the number of turns, ℓ is the length, A is the cross-sectional area, and μ is the permeability of the core.
For an inductor, what is the formula for current?
What is the formula for the instantaneous power delivered to an inductor?
What is the formula for the energy stored in an inductor?
In DC conditions, an inductor is a(n) __________ circuit.
Short
For inductors in series, what is the formula for equivalent voltage?
For inductors in series, what is the formula for equivalent inductance?
For inductors in parallel, what is the formula for equivalent current?
For inductors in parallel, what is the formula for equivalent inductance?
VIEW ONLY: Table of formulas for capacitors and inductors
1) The current through a capacitor is directly proportional to what?
2) The voltage across a capacitor is directly proportional to what?
3) The current through a capacitor is ________ unless the voltage is changing.
4) The voltage across a capacitor can/cannot change instantly?
1) The time rate of change of the voltage across it.
2) The time integral of the current through it.
3) Zero.
4) Cannot (but current can change instantaneously).
1) The voltage across an inductor is directly proportional to what?
2) The current through an inductor is directly proportional to what?
3) The voltage across an inductor is ________ unless the current is changing.
4) The current through an inductor can/cannot change instantly?
1) The time rate of change of the current through it.
2) The time integral of the voltage across it.
3) Zero.
4) Cannot (but voltage can change instantaneously).
