Circuit Phasor and Circuit Elements Flashcards
What are the two types of circuit elements?
Active elements and passive elements
Active elements include voltage sources and current sources, while passive elements include resistors, inductors, and capacitors.
Define active elements in a circuit.
Voltage source and current source
Active elements provide energy to the circuit.
Define passive elements in a circuit.
Resistors, inductors, capacitors
Passive elements consume or store energy.
What is the formula for the induced voltage in an inductor?
e = L * (di/dt)
Where e is the induced voltage, L is the inductance, and di/dt is the rate of change of current.
Calculate the voltage induced in a 30-mH inductance with current i = 10.0 sin 50t.
15 cos 50t volts
The induced voltage was derived using the formula e = L * (di/dt).
What is the current function given for the 0.1-H inductor in Example 2?
i = 10te^(-5t)
This function describes how the current changes over time.
What is the formula used to calculate the voltage across an inductor?
e = L * (di/dt)
This formula relates the voltage across an inductor to the rate of change of current.
What is the expression for the energy stored in an inductor?
W = (1/2) L I^2
Where W is the energy, L is the inductance, and I is the current.
Find the energy stored in a 0.1-H inductor with current i = 10te^(-5t).
5t^2e^(-10t) Joules
This result is derived from the energy formula and the given current function.
What is the formula for the energy stored in a capacitor?
W = (1/2) C E^2
Where W is the energy, C is the capacitance, and E is the voltage across the capacitor.
Calculate the energy stored in a 3-pF capacitor with 20 volts across it.
600 pJoules
This calculation uses the energy formula for capacitors.
it is the fractional part of a period through which time or the associated time angle has advanced from an arbitrary reference
phase
it is a two terminal passive device which has the ability to oppose any sudden change in the flow of current
inductor
measure of the ability of a device to store energy in the form of magnetic field
inductance
it is the opposition to ac current due to the inductance in the circuit.
inductance reactance
device eith the ability to store an electric charge
capacitor
measuure of the ability of a device to store energy
capacitance
the opposition to ac current due to the capacitance in the circuit
capacitive reactance
