Chapter 2 Flashcards
Ideal Basic Circuit Elements
There are 5 ideal basic circuit elements:
Voltage sources
Current sources
Resistors
Inductors
Capacitors
Ideal Basic Circuit Elements
Voltage sources
independent vs dependent
Independent source are those, whose value of either the voltage or the current to be delivered is independent of any other parameter of the network. Where as the dependent sources are those, whose value of either the voltage or the current to be delivered is dependent or controlled on other parameters of the network.
Ideal Basic Circuit Elements
Resistors
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
Ideal Basic Circuit Elements
inductor
An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.[1] An inductor typically consists of an insulated wire wound into a coil.
Ideal Basic Circuit Elements
Capacitor
A capacitor is a device that stores electrical energy in an electric field.
Ideal Voltage Source
*An ideal voltage source maintains a
prescribed ________________________
*If all we have is the voltage drop across
an ideal voltage source, there is no
formula we can use to calculate the
current through that source
Ideal Current Source
An ideal current source maintains a
prescribe____________ regardless of the____________those terminals.
If all we have is the current flowing
through an ideal current source, there
is no formula we can use to calculate
the voltage drop across that source
*An independent source establishes a _________
*A dependent source (or controlled
source) establishes ________
*An independent source establishes a
voltage or current in a circuit without
relying on voltages or currents
elsewhere in the circuit. They are
shown with circles.
*A dependent source (or controlled
source) establishes a voltage or
current whose value depends on the
value of a voltage or current elsewhere
in the circuit. They are shown with
diamonds.
*To completely specify an ideal dependent
we need:
* The controlling voltage/current;
* The associated equation;
* The reference polarity/direction.
μ and Q are dimensionless multiplying
constants.
α has the dimension amperes per volt.
ρ has the dimension volts per ampere.
How are voltage and current of a
resistor related?
Ohms Law
Conductance
By combining the equation for power, , with
Ohm’s law, we can determine the power absorbed by a
resistor:
p = i^2R = v^2/R.
the product of the terminal voltage and current
ρ = vi
when v = iR ρ = -vi
when v = - iR
A second method of expressing the power at the terminals of a resistor expresses power in terms of the current and the resistance.
Substituting Eq. 2.1 into Eq. 2.6, we obtain ______
Power in a resistor in terms of current ____
Power in a resistor in terms of voltage ____
when v = - iR
A second method of expressing the power at the terminals of a resistor expresses power in terms of the current and the resistance.
Substituting Eq. 2.1 into Eq. 2.6, we obtain ρ = - vi =-(iR)i = I^2R
Power in a resistor in terms of current ρ = I^2R
Power in a resistor in terms of voltage ρ = I^2/R
Ideal Switch
*A switch is ________ device.
*It is either________.
*When____ (a), there is ____________going through it. This is called
short circuit (R = 00).
*When____(b), there is ________ going through it.
This is called open circuit (R = co)
