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Electricity sem 2, test 1
31問 • 2年前
  • Zachary Halycz
    • 通報

    問題一覧

  • 1

    ______ is the current flow that continually changes its value and periodically reverses direction

    Alternating current

  • 2

    The waveform of alternating current produced by a rotating generator is called a ____ wave.

    Sine

  • 3

    How many advantages does A/C have over D/C? What are they?

    Two advantages, •easy to produce •can be stepped up or stepped down

  • 4

    In North America standard household AC is ____V @ ____ hz

    115V 400hz

  • 5

    The time required for one cycle of a sine wave to be completed is called the ____?

    Period

  • 6

    The number of complete cycles of a sine wave per second is the ____ A/C and is expressed in ____.

    Frequency, Hertz

  • 7

    Voltage used to compare heat from A/C circuits to heat from D/C circuits is called _____?

    Effective voltage / Vrms

  • 8

    Another name for the RMS value of A/C is the _____ value?

    Effective value

  • 9

    The RMS value of A/C is ____ times the peak volume

    Vrms = 0.707 x Vp

  • 10

    In an A/C circuit the product of the voltage and current is the _____ and is expressed in _____.

    Apparent power, Volt amps

  • 11

    A purely resistive circuit has the maximum power factor of _____?

    1

  • 12

    If we know the power factor we can calculate the _____ by using ___?

    Phase angle, Cos theta

  • 13

    ______ frequency is the frequency when inductive reactance and capacitive reactance are the same.

    Resonance

  • 14

    RLC circuits have elements of ?

    •resistance •inductive reactance •capacitive reactance

  • 15

    Capacitors in parallel are added like resistors in ____?

    Series

  • 16

    Capacitors in series are added like resistors in _____?

    Parallel

  • 17

    Inductors in series are added like resistors in____?

    Series

  • 18

    The three factors that affect a capacitors capacitance are?

    •plate area •distance between plates •material of the dielectric

  • 19

    The four factors that affect an inductors inductance are?

    •type of core material •number of turns in a coil •shape of the coil •wire gauge

  • 20

    An inductor store energy in a ____ field, while a capacitor stores energy in a ____field

    Magnetic, electrostatic

  • 21

    An inductor resists charges in _____, while a capacitor resists changes in _____?

    Current, voltage

  • 22

    Since capacitors resist charges in voltage, ____ leads _____?

    Current, voltage

  • 23

    Since inductors resist changes in current, _____ leads _____?

    Voltage, current

  • 24

    The time it takes a capacitor to charge to 63.2% is known as the _____. It is calculated by _____?

    Time constant, TC= R x C

  • 25

    After 1TC we can say that a capacitor is charged to ____% of the source voltage

    63.2

  • 26

    Transformers are typically either ____ or ____?

    Step up, step down

  • 27

    What type of transformer do we have if the input voltage is lower than the output voltage?

    Step-up

  • 28

    What does the term “coil turn ratio” mean?

    Compares number of coil turns in the primary side to the number of turns in the secondary side to determine step-up or step-down ratio

  • 29

    In order to measure voltage across any component, the test instrument has to be connected in ___ with the component.

    Parallel

  • 30

    In order to measure current through a circuit, the test instrument has to be placed in ____with the circuit.

    Series

  • 31

    Referring to an oscilloscope the X-axis represents the _____, while the Y- axis represents the______?

    •Time to determine period / frequency •amplitude to determine peak voltage / peak to peak voltage

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    問題一覧

  • 1

    ______ is the current flow that continually changes its value and periodically reverses direction

    Alternating current

  • 2

    The waveform of alternating current produced by a rotating generator is called a ____ wave.

    Sine

  • 3

    How many advantages does A/C have over D/C? What are they?

    Two advantages, •easy to produce •can be stepped up or stepped down

  • 4

    In North America standard household AC is ____V @ ____ hz

    115V 400hz

  • 5

    The time required for one cycle of a sine wave to be completed is called the ____?

    Period

  • 6

    The number of complete cycles of a sine wave per second is the ____ A/C and is expressed in ____.

    Frequency, Hertz

  • 7

    Voltage used to compare heat from A/C circuits to heat from D/C circuits is called _____?

    Effective voltage / Vrms

  • 8

    Another name for the RMS value of A/C is the _____ value?

    Effective value

  • 9

    The RMS value of A/C is ____ times the peak volume

    Vrms = 0.707 x Vp

  • 10

    In an A/C circuit the product of the voltage and current is the _____ and is expressed in _____.

    Apparent power, Volt amps

  • 11

    A purely resistive circuit has the maximum power factor of _____?

    1

  • 12

    If we know the power factor we can calculate the _____ by using ___?

    Phase angle, Cos theta

  • 13

    ______ frequency is the frequency when inductive reactance and capacitive reactance are the same.

    Resonance

  • 14

    RLC circuits have elements of ?

    •resistance •inductive reactance •capacitive reactance

  • 15

    Capacitors in parallel are added like resistors in ____?

    Series

  • 16

    Capacitors in series are added like resistors in _____?

    Parallel

  • 17

    Inductors in series are added like resistors in____?

    Series

  • 18

    The three factors that affect a capacitors capacitance are?

    •plate area •distance between plates •material of the dielectric

  • 19

    The four factors that affect an inductors inductance are?

    •type of core material •number of turns in a coil •shape of the coil •wire gauge

  • 20

    An inductor store energy in a ____ field, while a capacitor stores energy in a ____field

    Magnetic, electrostatic

  • 21

    An inductor resists charges in _____, while a capacitor resists changes in _____?

    Current, voltage

  • 22

    Since capacitors resist charges in voltage, ____ leads _____?

    Current, voltage

  • 23

    Since inductors resist changes in current, _____ leads _____?

    Voltage, current

  • 24

    The time it takes a capacitor to charge to 63.2% is known as the _____. It is calculated by _____?

    Time constant, TC= R x C

  • 25

    After 1TC we can say that a capacitor is charged to ____% of the source voltage

    63.2

  • 26

    Transformers are typically either ____ or ____?

    Step up, step down

  • 27

    What type of transformer do we have if the input voltage is lower than the output voltage?

    Step-up

  • 28

    What does the term “coil turn ratio” mean?

    Compares number of coil turns in the primary side to the number of turns in the secondary side to determine step-up or step-down ratio

  • 29

    In order to measure voltage across any component, the test instrument has to be connected in ___ with the component.

    Parallel

  • 30

    In order to measure current through a circuit, the test instrument has to be placed in ____with the circuit.

    Series

  • 31

    Referring to an oscilloscope the X-axis represents the _____, while the Y- axis represents the______?

    •Time to determine period / frequency •amplitude to determine peak voltage / peak to peak voltage