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EE > Basic Principles of Electricity > Flashcards

Basic Principles of Electricity Flashcards

1
Q

Weight of a Proton and a Neutron

A

1.672 x 10^-27 kg

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2
Q

Formula for total valence electrons given an nth shell

A

N=2n^2

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3
Q

What is Atomic Number?

A

Number of protons in an atom

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4
Q

Unit of Electric Charge

A

Coulumb

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5
Q

One coulomb equals how many electrons

A

6.25 x 10 ^18

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6
Q

Unit of potential difference

A

Volt

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7
Q

Equal to one joule of work done per one coulomb of charge

A

Volt

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8
Q

Happens when a potential difference between two charges forces a third charge to move

A

Current

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9
Q

Unit of flow of charge

A

Ampere

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10
Q

Equal to one coulomb of charge past a given point in one second

A

1 Ampere

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11
Q

Rate of absorbing or expending energy, measured in watts

A

Power

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12
Q

Capacity to do work, measured in joules

A

Energy

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13
Q

1 watt-hour is equal to how many joules

A

3600 J

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14
Q

Property of materials that opposes or resist the flow of electrons, unit in ohms

A

Resistance

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15
Q

Formula of resistance with respect to Length and Area of a conductor

A

R = (Rho x Length) / Area

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16
Q

Formula of resistance with respect to Volume and Area

A

R = (Rho x Volume) / Area^2

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17
Q

Formula of resistance with respect to Length and Volume

A

R = (Rho x Length^2) / Volume

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18
Q

Resistance by a Unit cube of the material. Normally measured at 20 degrees Celsius reference Temperature

A

Specific Resistance (Resistivity)

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19
Q

Area of a Circle with a diameter of 1 Mil

A

Circular Mil

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20
Q

1 inch is equal to how many mils

A

1000 mils

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21
Q

1 sq. inch is equal to how many sq. mils?

A

10^6 sq. mils

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22
Q

1 sq. inch is equal to how many Circular Mils

A

4/pi x 10^6 CM

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23
Q

As resistance increases, temperature _________?

A

Increases

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24
Q

What is the specific resistance/resistivity of Hard-drawn Copper in Ohm-Meter at 20 degrees Celsius

A

1.77 x 10^-8

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25
Q

What is the specific resistance of Hard-drawn copper in Ohm-CM per ft at 20 degrees C?

A

10.66

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26
Q

What is the specific resistance/resistivity of Annealed Copper in Ohm-Meter at 20 degrees Celsius

A

1.72 x 10^-8

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27
Q

What is the specific resistance of Annealed copper in Ohm-CM per ft at 20 degrees C?

A

10.50

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28
Q

What is the specific resistance/resistivity of Aluminum in Ohm-Meter at 20 degrees Celsius

A

2.83 x 10^-8

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29
Q

What is the specific resistance of Annealed copper in Ohm-CM per ft at 20 degrees C?

30
Q

What is the inferred absolute zero resistance temperature of a Hard-drawn Copper?

A
  • 242 degrees C
31
Q

What is the inferred absolute zero resistance temperature of a Annealed Copper?

A
  • 234.5 degrees C
32
Q

What is the inferred absolute zero resistance temperature of a Aluminum?

A
  • 236 degrees C
33
Q

In metric standard, as the number of gage increase, the wire size _____?

34
Q

What is the reciprocal of resistance?

A

Conductance

35
Q

Unit of conductance?

36
Q

The current flowing in an electric circuit is directly proportional to the impressed emf applied to the circuit and inversely to the equivalent resistance.

A

Ohm’s Law

37
Q

Unit of electrical energy

38
Q

One joule of energy in one second is equal to how many watt/s?

39
Q

What is the capacity to do work?

40
Q

For American Wire Gauge, as the gage increases the size of the conductor _______?

41
Q

In both series and parallel circuits the power is ______?

42
Q

The heat produced in a current carrying conductor is proportional to ________?

A

Square of the current (I^2)

43
Q

1 calorie is equal to how many joules?

A

4.186 Joules

44
Q

1 BTU = _______ calories

A

252 calories

45
Q

Work = ______ x time

46
Q

Formula for Equivalent Heat Energy in an Electrical Circuit

A

Q = 0.24Pt

P = Power
t = time
47
Q

Formula for Q when there is a change in temperature?

A

Q = mc(T2 - T1)

48
Q

VDT is used in ________ - connected Resistors

49
Q

In VDT, the total voltage is multiplied to the ______ resistor where the voltage needs to be found. (HInt: same or other)

50
Q

In this circuit, the total current is equal to the current experienced by each component.

A

Series Circuit

51
Q

In this circuit, the total voltage is the sum of all the voltages experienced by the components.

A

Series Circuit

52
Q

In this circuit the total current is equal to the sum of all current experienced by each component.

53
Q

In this circuit the total voltage is equal to the voltage experienced by each component.

54
Q

In CDT, the total current is multiplied to the _______ resistor to find the current needed. (Hint: same or other)

55
Q

In a delta connected circuit with all its resistors having equal resistances the equivalent resistances in wye will be?

A

R(delta) = 3R (wye)

56
Q

In a wye connected circuit with all its resistors having equal resistances the equivalent resistances in delta will be?

A

R(wye) = R(delta) / 3

57
Q

This states that the algebraic sum of currents entering a node is zero.

A

KCL (Kirchoff’s Current Law)

58
Q

This states that the algebraic sum of all voltages around a closed path or loop is zero

A

Kirchoff’s Voltage Law (KVL)

59
Q

This states that the current in any resistor is equal to the algebraic sum of the currents delivered by each independent sources assuming that each source is acting alone or independently with respect to others.

A

Superposition Theorem

60
Q

This theorem can only be applied to circuits having linear bilateral elements

A

Superposition Theorem

61
Q

This theorem is used when the no. of voltage sources are in parallel having internal resistances respectively, the arrangement can be replaced with an equivalent voltage source V in series resistance R.

A

Millman’s Theorem

62
Q

A linear two-terminal ckt can be replaced by an equivalent consisting of a voltage source in series with an equivalent resistance

A

Thevenin’s Theorem

63
Q

A linear two-terminal ckt can be replaced by an equivalent ckt consisting of a current source in parallel with an equivalent resistance.

A

Norton’s Theorem

64
Q

In a circuit with the Voltage source in series with the resistor, how do you calculate for its equivalent current source and how do you connect the new equivalent circuit.

A

Voltage/Resistor , parallel

65
Q

In a circuit with the current source in parallel to a resistor, how do you compute for its equivalent voltage source and how do you connect its equivalent circuit

A

Current source x Resistor , Series

66
Q

Maximum Power is transferred to the load if the load resistance equals the _________ resistance as seen from the load terminals

A

Thevenin’s

67
Q

Pmax = ________?

A

(Thevenin Voltage)^2 / 4 x Load resistance

68
Q

The level of current that is considered dangerous to human and can cause temporary paralysis

69
Q

The level of current that can cause Severe Shock when exposed to Human.

70
Q

The level of current that may cause Human Fatality if exposed

EE (3 decks)

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