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ECE > Test 2 > Flashcards

Test 2 Flashcards

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1
Q

Which module is added the opposite way of resistors

A

Capacitors

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2
Q

Which module is added like resistors?

A

Inductors

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3
Q

What is a dielectric?

A

A material through which virtually no current flows

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4
Q

What are examples of dielectrics

A

Air, polyester, porcelain, clay, glass

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5
Q

What measures how good a capacitor stores energy?

A

Permittivity

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6
Q

What is the most common type of capacitor in computers?

A

Ceramic

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7
Q

What do diodes do

A

Only allow current to flow one way

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8
Q

What does masking do?

A

Selectively dope p or n

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9
Q

Why do we use NAND and NOR instead of AND and OR

A

To use fewer transitors

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10
Q

What is a 1 represent in a truth table?

A

5V

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11
Q

When voltage is constant what is the current through a capacitor?

A

Zero

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12
Q

What would an abrupt change on a capacitor’s plates require?

A

Infinite current

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13
Q

Capacitors in parallel have the same?

A

Voltage

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14
Q

w=(1/2)C(v^2)

A

Formula for work relating to capacitance and voltage

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15
Q

C=(q(t))/(v(t))

A

Capacitance vs change in charge over change in voltage

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16
Q

How does a capacitor act in DC circuits?

A

Like an open circuit

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17
Q

Where do inductors store energy?

A

In it’s magnetic field

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18
Q

Flux = (Flux Density)*(Area)

A

Phi = BA

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19
Q

V= L (di)/(dt)

A

Voltage = Inductance * change in current over time

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20
Q

What is an Henry

A

Unit of inductance, 1 Volt Second per Ampere

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21
Q

L = ((N^2)uA)/l

A

Inductance = Number of turns^2 * permeability* cross sectional area divided by length

22
Q

Energy stored in an inductor

A

w=(1/2)L(i)^2

23
Q

If the current through an inductor is constant what is the voltage?

A

Zero

24
Q

What could happen if the current across an inductor changed instantly?

A

The voltage would be infinity

25
Q

How does an inductor act in DC?

A

Like a short

26
Q

Inductors react fast or slow?

A

Slow, resist changes in current

27
Q

Capacitors act fast or slow?

A

Fast, max current at zero voltage

28
Q

When dividing decimal into binary what order do the remainders go?

A

Reverse order

29
Q

What order do you go when multiplying decimals?

A

Not reverse order

30
Q

How many bits in a byte

A

8 bits

31
Q

How big are the groups from binary to octal?

A

3 bits

32
Q

How big are the groups from binary to hexadecimal?

A

4 bits

33
Q

How to change the sign in signed magnitude?

A

Change the sign bit (farthest left)

34
Q

What ranges of numbers can you represent in sign bit

A

-127 to 127

35
Q

AĀ=

A

0

36
Q

-
Ā

A

A

37
Q

And truth table

A

AB
Only high when all are high

38
Q

What shape is the And gate?

A

Rounded semicircle

39
Q

Or gate

A

A+B
High when either is high

40
Q

What shape is the Or gate?

A

Arrow

41
Q

NAND

A

High when neither or high or one is high, low when both are high

42
Q

NOR

A

High only when both are low

43
Q

XOR

A

High only when one is high, low for anything else

44
Q

XNOR

A

Only high when both are the same (both high or both low)

45
Q

What rows represent SOP

A

High rows

46
Q

What rows represent POS

A

Low rows

47
Q

For SOP what do all bits need to be?

A

High

48
Q

How do you combine SOP expressions?

A

Or

49
Q

What does every bit need to be in POS expressions?

A

Low

50
Q

How do you combine POS expressions?

A

With And gates

51
Q

i(t)=C(dV(t))/(dt)

A

Current = capacitance* change in voltage over time

52
Q

Power in an indcutor

A

P= L((di/dt))i

ECE (1 decks)

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