Test 2 Flashcards
Which module is added the opposite way of resistors
Capacitors
Which module is added like resistors?
Inductors
What is a dielectric?
A material through which virtually no current flows
What are examples of dielectrics
Air, polyester, porcelain, clay, glass
What measures how good a capacitor stores energy?
Permittivity
What is the most common type of capacitor in computers?
Ceramic
What do diodes do
Only allow current to flow one way
What does masking do?
Selectively dope p or n
Why do we use NAND and NOR instead of AND and OR
To use fewer transitors
What is a 1 represent in a truth table?
5V
When voltage is constant what is the current through a capacitor?
Zero
What would an abrupt change on a capacitor’s plates require?
Infinite current
Capacitors in parallel have the same?
Voltage
w=(1/2)C(v^2)
Formula for work relating to capacitance and voltage
C=(q(t))/(v(t))
Capacitance vs change in charge over change in voltage
How does a capacitor act in DC circuits?
Like an open circuit
Where do inductors store energy?
In it’s magnetic field
Flux = (Flux Density)*(Area)
Phi = BA
V= L (di)/(dt)
Voltage = Inductance * change in current over time
What is an Henry
Unit of inductance, 1 Volt Second per Ampere
L = ((N^2)uA)/l
Inductance = Number of turns^2 * permeability* cross sectional area divided by length
Energy stored in an inductor
w=(1/2)L(i)^2
If the current through an inductor is constant what is the voltage?
Zero
What could happen if the current across an inductor changed instantly?
The voltage would be infinity
How does an inductor act in DC?
Like a short
Inductors react fast or slow?
Slow, resist changes in current
Capacitors act fast or slow?
Fast, max current at zero voltage
When dividing decimal into binary what order do the remainders go?
Reverse order
What order do you go when multiplying decimals?
Not reverse order
How many bits in a byte
8 bits
How big are the groups from binary to octal?
3 bits
How big are the groups from binary to hexadecimal?
4 bits
How to change the sign in signed magnitude?
Change the sign bit (farthest left)
What ranges of numbers can you represent in sign bit
-127 to 127
AĀ=
0
-
Ā
A
And truth table
AB
Only high when all are high
What shape is the And gate?
Rounded semicircle
Or gate
A+B
High when either is high
What shape is the Or gate?
Arrow
NAND
High when neither or high or one is high, low when both are high
NOR
High only when both are low
XOR
High only when one is high, low for anything else
XNOR
Only high when both are the same (both high or both low)
What rows represent SOP
High rows
What rows represent POS
Low rows
For SOP what do all bits need to be?
High
How do you combine SOP expressions?
Or
What does every bit need to be in POS expressions?
Low
How do you combine POS expressions?
With And gates
i(t)=C(dV(t))/(dt)
Current = capacitance* change in voltage over time
Power in an indcutor
P= L((di/dt))i
