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SEM 6_EE 210 > CH 2_BOOK_BASIC LAWS > Flashcards

CH 2_BOOK_BASIC LAWS Flashcards

1
Q

Does a resistor obey Ohm’s law?

A

Yes: A resistor is a passive element in which the voltage v across it is DIRECTLY PROPORTIONAL to the current i through it.

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2
Q

What is the formula for Ohm’s law?

A

v = iR

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3
Q

Is a short circuit a resistor?

A

Yes, with ZERO resistance.

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4
Q

Is an open circuit a resistor?

A

Yes, with INFINITE resistance.

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5
Q

What is the formula for CONDUCTANCE?

A
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6
Q

The CONDUCTANCE of a resistor is the ____ of its resistance?

A

Reciprocal

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7
Q

What is a branch?

A

A single two-terminal element in an electric circuit (such as a voltage source or resistor).

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8
Q

What is a node?

A

The point of connection between 2 or more branches.

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9
Q

What is a loop?

A

A closed path in a circuit.

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10
Q

A network with (b) branches, (n) nodes, and (l) independent loops will satisfy the fundamental theorem of network topology. What is this formula?

A
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11
Q

Kirchhoff’s Current Law (KCL) states that currents at any node algebraically sum to ____?

A

Zero

(N) Number of branches connected to the node
(i_n) nth current entering (or leaving) the node.

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12
Q

The sum of currents entering a node equals?

A

The sum of currents leaving the node.

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13
Q

Kirschhoff’s Voltage Law (KVL) states that the voltages around a closed path algebraically sum to ____?

A

Zero

(M) Number of voltages/branches in the loop
(V_m) The mth voltage

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14
Q

Two or more elements are in series if?

A
  • Share a single node (that is not shared by other elements)
  • Carry the same current
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15
Q

When elements are in series, is the current that flows through them the same or different?

A

The same (i_1 = i_2)

(But not the same voltage)

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16
Q

When are two or more elements in parallel?

A
  • Connected to the same two nodes
  • Same voltage across them
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17
Q

Do elements in parallel have the same voltage or current?

A

Same voltage, different current.

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18
Q

When two resistors are in SERIES, what are the formulas for their Equivalent Resistance (R_eq) and Equivalent Conductance (G_eq) ?

A
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19
Q

When two resistors are in PARALLEL, what are the formulas for their Equivalent Resistance (R_eq) and Equivalent Conductance (G_eq) ?

A
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20
Q

The VOLTAGE division principle for two resistors in SERIES is:

A
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21
Q

The CURRENT division principle for two resistors in PARALLEL is:

A
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22
Q

The formulas for a delta-to-wye transformation are:

A
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23
Q

The formulas for a wye-to-delta transformation are:

A
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24
Q

What is resistance?

A

Ability to resist current.

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25
Q

What is the formula for resistance?

A

p = Resistivity of material
l = Length
A = Cross-sectional area

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26
Q

VIEW ONLY: Resistivities of common materials.

A
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27
Q

Ohm’s Law states that the voltage (v) across a resistor is ____ ____ to the current (i) flowing through the resistor.

A

Directly proportional

28
Q

Refer to the formula for resistance (R) and rewrite it in terms of their units.

A
29
Q

The direction of current (i) and polarity of voltage (v) must conform with the ____ sign convention.

A

Passive.

30
Q

When v=iR, how does current flow?

A

Current flows from a higher potential to a lower potential.

31
Q

When v=-iR, how does current flow?

A

Current flows from a lower potential to higher potential.

32
Q

The value of Resistance can range from ____ to ____?

A

Zero to infinity.

33
Q

A common variable resistor is also known as a?

A

Potentiometer

34
Q

What are the 2 common types of resistors?

A

a) Wirewound
b) Carbon film

35
Q

What are the circuit symbols for
a) A variable resistor in general
b) A potentiometer

A
36
Q

What are the 2 types of variable resistors?

A

1) Composition
2) Slider pot

37
Q

Do all resistors obey Ohm’s law?

A

No.

38
Q

A resistor that obeys Ohm’s Law is known as a ____ resistor.

A

Linear

39
Q

What makes a resistor LINEAR?

A

It has a constant resistance.

40
Q

What makes a resistor NON-LINEAR?

A

Its resistance varies with current

41
Q

What is CONDUCTANCE? What is its SI unit?

A

Conductance is the ability of an element to conduct electric current; it is measured in mhos (℧) or siemens (S).

42
Q

From the formula for conductance, what is the formula for current?

A
43
Q

What is the formula for power in terms of resistance (R)?

A
44
Q

What is the formula for power in terms of conductance (G)?

A
45
Q

The POWER dissipated in a resistor is a linear or non-linear function of either current or voltage?

A

Non-linear

46
Q

Since R and G are positive quantities, the power dissipated in a resistor is always positive. Thus, a resistor always ____ power from the circuit. This confirms the idea that a resistor is a ____ element, incapable of generating energy.

A

Absorbs, passive

47
Q

A loop is said to be ____ if it contains at least one branch which is not a part of any other ____ loop.

A

Independent, independent

48
Q

Referring to this illustration, rearrange the terms to show the currents entering and leaving the node.

A
49
Q

VIEW ONLY: Parallel circuit KCL

A
50
Q

Two circuits (or circuits in general) are said to be equivalent if they have the same ____________?

A

i-v relationship at a pair of terminals.

51
Q

In this example, use KVL to get an equation of the voltages around the loop.

Rearrange the terms to follow the formula:
Sum of voltage drops = sum of voltage rises

A
52
Q

What are the voltage and current formulas for resistors in series?

A

Voltage can also be written as v = iR_eq

53
Q

The ____ ____ of any number of resistors connected in series is the sum of the individual resistors.

A

Equivalent resistance

54
Q

Resistors in SERIES behave as:

A

A single resistor whose resistance is equal to the sum of the resistances of the individual resistors.

55
Q

To determine the voltage across each resistor in series, we use which formula?

A
56
Q

Referring to the Principle of Voltage, if a voltage divider has N resistors (R_1, R_2,…, R_N) in series with the source voltage (v), the nth resistor will have a voltage drop of: (Provide formula)

A
57
Q

In an example of two resistors in parallel, observe the formulas derived for voltage and current.

What formula do we get for current in terms of voltage and equivalent resistance?

A
58
Q

From this formula for equivalent resistance for resistors in parallel, what formula can we derive for equivalent resistance?

A
59
Q

The Equivalent Resistance of two parallel resistors is equal to ________________?

A

The product of their resistances divided by their sum.

60
Q

VIEW ONLY: Equivalent Resistance in parallel circuit

A
61
Q

In parallel, R_eq is always smaller/bigger than the resistance of the smallest resistor in the circuit?

A

Smaller

62
Q

Conductances in parallel behave as ?

A

A single conductance whose value is equal to the sum of the individual conductances.

63
Q

The ____ ____ of resistors connected in parallel is the sum of their individual conductances.

What is the formula for G_eq?

A
64
Q

What is the formula for the equivalent conductance G_eq of N resistors in series?

A
65
Q

VIEW ONLY: Current Divider (series)

A
66
Q

STILL MISSING WYE-DELTA INFO

A

SEM 6_EE 210 (8 decks)

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