ECE 2205 Theory Flashcards
What does a resistor do?
Resists the flow of current
List passive circuit elements
-Resistors
-Inductors
-Conductors
What does an inductor produce?
-Produces a voltage based upon the opposition to change in electric current
What does a capacitor produce?
-Produces a current based upon a time varying electric field
What does a inductor store?
-Stores energy in the form of current
What does a capacitor store?
-Stores energy in the form of voltage
What cannot change abruptly through an inductor?
Current
What can change abruptly through an inductor?
Voltage
-Depends on whether it is storing or releasing energy
What cannot change abruptly through a capacitor?
Voltage
What can change abruptly through a capacitor?
Current
-Depends on whether it is storing or releasing energy
List at least one disadvantage of color resistors?
difficult for blind people to determine the value of the resistor
Does the value of resistance of a resistor change with ambient temperature?
Yes
Is there a formula to determine the value of resistance of a resistor as a function of ambient temperature? What is the formula?
Yes
R = R0[1 + α(T-T0)]
Does the value of resistance depend on the physical dimensions and the type of material used to construct a resistor? If yes, is there a formula to determine the value of resistance of a resistor?
Yes
R = p(L/A)
List 4 applications of resistors
-Electric heaters
-Electric ovens
List some materials used to construct resistors
-Wirewound (WW)
-Carbon Composition (CCR)
-Carbon film
-Metal film
-Metal Oxide Film
-Foil
What is the relationship between power dissipated by a resistor, voltage across it, and current flowing through it?
p = v i
p = i^2 R
p = v^2 / R
How can one experimentally measure power dissipated by a resistor?
measure the power dissipated in a resistor by measuring the voltage
across the resistor and the current flowing through it- Find the product
How are bias errors different from random errors?
Bias errors are the same each time a measurement is made
Random errors vary between repeated measurements
List four types bias errors
-Offset error
-Scale error
-Nonlinearity error
-hysteresis error
Explain how precision, accuracy, and resolution of an instrument are different
-Accuracy is the maximum expected difference in magnitude in measured and true values (often
expected as a percentage of the full-scale value)
-Precision is the ability of the instrument to repeat the measurement of the quantity measured
-Resolution is the smallest possible increment discernible between measured values
What are two causes of “loading effects” in an amplifier circuit?
Loading effects can occur either at the input or output of an amplifier. The
output voltage decreases when a load is connected because the current
drawn by the load causes a voltage drop across the output impedance of
the amplifier. The voltage at the source terminals decreases when the
amplifier is connected because the current drawn by the amplifier results in
a voltage drop across the internal resistance of the source.
Explain how an inverting amplifier differs from a noninverting amplifier?
An inverting amplifier has negative voltage gain. The output waveform is an
inverted version of the input (usually with larger amplitude). A noninverting
amplifier has positive voltage gain, and the output waveform is the same as
the input except that it (usually) has larger amplitude.
