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Elec Eng Adv Dip Sem 1 (Jul 2020) > AC & DC Circuits > Flashcards

AC & DC Circuits Flashcards

1
Q

Tera

A

12

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2
Q

Giga

A

9

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3
Q

Mega

A

6

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4
Q

Kilo

A

3

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5
Q

Milli

A

-3

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6
Q

Micro

A

-6

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7
Q

Nano

A

-9

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8
Q

Pico

A

-12

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9
Q

Ohm’s Law

A

V = IR, I = V/R, R = V/I

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10
Q

Wattage

A

V x I

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11
Q

Doping

A

The introduction of impurities into a semiconductor crystal to the defined modification of conductivity

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12
Q

Doping

A

The introduction of impurities into a semiconductor crystal to the defined modification of conductivity

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13
Q

Coulomb (C)

A

Is the standard unit of electric charge (Q) in the International System of Units

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14
Q

EMF

A

Electromotive Force (E); the unit of which is the Volt (V)

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15
Q

Potential Difference

A

The voltage between two points

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16
Q

Joule

A

Unit of Work

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17
Q

Hole

A

The positive charge remaining when a valence electron detaches

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18
Q

Resistance Colour Code

A

…

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19
Q

Integrated Circuit

A

…

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20
Q

Tolerance

A

…

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21
Q

R = pL/A

A

Formula for calculating Resistance - Material Resistance (measured in ohm-meters or ohm-centimeters) multiplied by Length of object, divided by cross-sectional Area

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22
Q

R = R20(1 + a20(t - 20))

A

Formula for calculating Resistance when the temperature is less or greater than 20 degrees celsius. ‘a20’ is a material’s temperature coefficient.

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23
Q

dV/dt

A

…

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24
Q

Voltage Drop

A

…

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25
Q

1 Horsepower

A

746 Watts

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26
Q

Efficiency (η)

A

…

27
Q

Kirchoff’s Voltage Law (KVL)

A

…

28
Q

Load

A

Device(s) within a circuit which draw electricity

29
Q

Kirchoff’s Current Law (KCL)

A

…

30
Q

CDR

A

Current Divider Rule

31
Q

VDR

A

Voltage Divider Rule

32
Q

Meter Loading

A

…

33
Q

AM (Amplitude Modulation)

A

…

34
Q

FM (Frequency Modulation)

A

…

35
Q

Capacitive Reactance

A

…

36
Q

Dielectric

A

The insulation material between a capacitor.

37
Q

Stray Frequency

A

A problem with capacitors in high frequency AC circuits

38
Q

Permittivity

A

The ability of a substance to store electrical energy in an electric field. The ease with which lines of electrical flux are

39
Q

Farad (Unit)

A

The unit of capacitance

40
Q

Transient

A

A momentary pulse of current from a capacitor at the instant of switch closure

41
Q

Mutual Capacitance

A

…

42
Q

Time Constant (τ)

A

The time constant, τ is found using the formula T = R x C in seconds.

43
Q

Decay Equation

A

Vr (Resistor Voltage) = E(e^-t/τ)

44
Q

Growth Equation

A

Vc (Capacitor Voltage) = E(1 - e^-t/τ)

45
Q

Discharge Equations

A

…

46
Q

Compound/Combination Circuit

A

A circuit using a combination components in both series and parallel

47
Q

Polar Form

A

…

48
Q

Rectangular Form

A

…

49
Q

Phasor Form

A

…

50
Q

Formula for Current across Capacitor

A

Ic = Q/t = EC/t

Current equals Coloumbs divided by seconds, or Voltage times Capacitance divided by seconds.

51
Q

Inverter and Rectifier

A

An inverter and a rectifier perform opposite functions in electronic circuits. Both act as electric power converters; a rectifier changes current from alternating current (AC) to direct current (DC), while an inverter converts DC to AC.

52
Q

Admittance

A

Admittance is the reciprocal of impedance, Z and is given the symbol Y. In AC circuits admittance is defined as the ease at which a circuit composed of resistances and reactances allows current to flow when a voltage is applied taking into account the phase difference between the voltage and the current.

53
Q

Capacitive and Inductive Susceptance

A

Susceptance is the reciprocal of of a pure reactance, X and is given the symbol B. In AC circuits susceptance is defined as the ease at which a reactance (or a set of reactances) allows an alternating current to flow when a voltage of a given frequency is applied.

54
Q

Resonance

A

Electrical resonance occurs in an AC circuit when the two reactances which are opposite and equal cancel each other out as XL = XC and the point on the graph at which this happens is were the two reactance curves cross each other. … This is because at resonance they are cancelled out.

55
Q

Tuned Circuit

A

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

56
Q

Q Factor

A

In physics and engineering the Quality Factor or Q Factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. It is defined as the ratio of the peak energy stored in the resonator in a cycle of oscillation to the energy lost per radian of the cycle.

57
Q

Apparent Power

A

The combination of reactive power and true power is called apparent power, and it is the product of a circuit’s voltage and current, without reference to phase angle. Apparent power is measured in the unit of Volt-Amps (VA) and is symbolized by the capital letter S

58
Q

Volt-Ampere

A

A volt-ampere is the unit used for the apparent power in an electrical circuit. The apparent power equals the product of root-mean-square voltage and RMS current. In direct current circuits, this product is equal to the real power in watts. Volt-amperes are useful only in the context of alternating current circuits.

59
Q

Duty Cycle

A

A duty cycle is the percentage of the waveform that occurs above the zero axis. The duty cycle of a square wave is always 50%, or 1/2. Because the duty cycle is 1/2, every second harmonic is not present.

60
Q

Fractional Frequency

A

f2-f1/fs = 1/Qs

61
Q

Power Factor Correction

A

Power-factor correction increases the power factor of a load, improving efficiency for the distribution system to which it is attached. Linear loads with low power factor (such as induction motors) can be corrected with a passive network of capacitors or inductors.

62
Q

Compensated and Uncompensated

A

The current after and before Power Factor Correction

63
Q

Quality Factor

A

Reactive Power / Real Power = I^2 * X / I^2 * R = X / R

64
Q

Bandwidth Formula

A

Frequency / Quality Factor = f / Q

Elec Eng Adv Dip Sem 1 (Jul 2020) (9 decks)

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