ECE 2205 Theory

Question 1

What does a resistor do?

Answer 1

Resists the flow of current

Question 2

List passive circuit elements

Answer 2

-Resistors
-Inductors
-Conductors

Question 3

What does an inductor produce?

Answer 3

-Produces a voltage based upon the opposition to change in electric current

Question 4

What does a capacitor produce?

Answer 4

-Produces a current based upon a time varying electric field

Question 5

What does a inductor store?

Answer 5

-Stores energy in the form of current

Question 6

What does a capacitor store?

Answer 6

-Stores energy in the form of voltage

Question 7

What cannot change abruptly through an inductor?

Answer 7

Current

Question 8

What can change abruptly through an inductor?

Answer 8

Voltage
-Depends on whether it is storing or releasing energy

Question 9

What cannot change abruptly through a capacitor?

Answer 9

Voltage

Question 10

What can change abruptly through a capacitor?

Answer 10

Current
-Depends on whether it is storing or releasing energy

Question 11

List at least one disadvantage of color resistors?

Answer 11

difficult for blind people to determine the value of the resistor

Question 12

Does the value of resistance of a resistor change with ambient temperature?

Answer 12

Yes

Question 13

Is there a formula to determine the value of resistance of a resistor as a function of ambient temperature? What is the formula?

Answer 13

Yes
R = R0[1 + α(T-T0)]

Question 14

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?

Answer 14

Yes
R = p(L/A)

Question 15

List 4 applications of resistors

Answer 15

-Electric heaters
-Electric ovens

Question 16

List some materials used to construct resistors

Answer 16

-Wirewound (WW)
-Carbon Composition (CCR)
-Carbon film
-Metal film
-Metal Oxide Film
-Foil

Question 17

What is the relationship between power dissipated by a resistor, voltage across it, and current flowing through it?

Answer 17

p = v i
p = i^2 R
p = v^2 / R

Question 18

How can one experimentally measure power dissipated by a resistor?

Answer 18

measure the power dissipated in a resistor by measuring the voltage
across the resistor and the current flowing through it- Find the product

Question 19

How are bias errors different from random errors?

Answer 19

Bias errors are the same each time a measurement is made
Random errors vary between repeated measurements

Question 20

List four types bias errors

Answer 20

-Offset error
-Scale error
-Nonlinearity error
-hysteresis error

Question 21

Explain how precision, accuracy, and resolution of an instrument are different

Answer 21

-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

Question 22

What are two causes of “loading effects” in an amplifier circuit?

Answer 22

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.

Question 23

Explain how an inverting amplifier differs from a noninverting amplifier?

Answer 23

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.