Applications of Inductance in Everyday Electronics
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Questions and Answers

What is the purpose of the self-induced EMF in a conductor?

  • To oppose a change in the current magnitude (correct)
  • To induce a voltage in an external circuit
  • To increase the current in the conductor
  • To create a stronger magnetic field around the conductor

    • Why does the induced voltage in the conductor only last for a fraction of a second?

  • The magnetic field becomes stationary as soon as the maximum current is flowing (correct)
  • The conductor becomes saturated and can no longer induce a voltage
  • The induced voltage is only present during the initial change in current
  • The conductor heats up and loses its ability to generate an induced voltage

    • What is the relationship between the direction of the induced EMF and the effect that produced it?

  • The induced EMF has no relationship to the effect that produced it
  • The induced EMF has a random direction that is unrelated to the effect
  • The induced EMF has the opposite direction to the effect that produced it (correct)
  • The induced EMF has the same direction as the effect that produced it

    • How does a straight length of conductor exhibit inductance?

    <p>The changing current in the conductor produces a changing magnetic field</p> Signup and view all the answers

    What is the name for the induced EMF that opposes a change in current in a conductor?

    <p>Counterelectromotive force</p> Signup and view all the answers

    What is the primary cause of the self-induced EMF in a conductor?

    <p>The changing magnetic field around the conductor</p> Signup and view all the answers

    How does Lenz's law describe the relationship between the induced EMF and the effect that produced it?

    <p>The induced EMF has the opposite direction to the effect that produced it</p> Signup and view all the answers

    What is the overall effect of the counterelectromotive force (CEMF) in a conductor?

    <p>It decreases the current in the conductor</p> Signup and view all the answers

    What is the result of inductance in a conductor?

    <p>Voltage being induced</p> Signup and view all the answers

    In which application is inductance used to detect very weak electromagnetic waves?

    <p>Aviation Australia Antenna</p> Signup and view all the answers

    What material restricts a sudden surge in current through a toroidal choke?

    <p>Soft iron cylinder</p> Signup and view all the answers

    What happens if the current in an electrical circuit with inductance increases?

    <p>The induced current tries to stop the increase</p> Signup and view all the answers

    What causes an EMF in a coil when radio waves pass through a radio antenna?

    <p>Oscillating magnetic field of the electromagnetic waves</p> Signup and view all the answers

    Why is heat dissipated only in the metal pot of an induction stove and not the glass pot or stovetop?

    <p>Metal pot is a conductor, while glass pot and stovetop are insulators</p> Signup and view all the answers

    Which component multiplies the flux change when a sudden surge in current is partially choked off by a toroidal choke?

    <p>Soft iron cylinder surrounding the wire</p> Signup and view all the answers

    What does inductance oppose in an electrical circuit?

    <p>Any change in current</p> Signup and view all the answers

    What does AC stand for?

    <p>Alternating current</p> Signup and view all the answers

    Which type of waveform is produced by the simplest and cheapest electronic oscillator?

    <p>Square wave</p> Signup and view all the answers

    What is the characteristic of a sinusoidal waveform?

    <p>It is symmetrical and varies equally around a fixed level.</p> Signup and view all the answers

    How is a sinusoidal waveform related to the rotary motion of an alternator?

    <p>The amplitude is proportional to the sine value corresponding to the angle of rotation.</p> Signup and view all the answers

    What is the characteristic of an alternating quantity described as sinusoidal?

    <p>Its trace, plotted against a linear time base, is a sine wave.</p> Signup and view all the answers

    What is the characteristic of AC (alternating current)?

    <p>Electrons flow first in one direction, then in the other.</p> Signup and view all the answers

    How do current and voltage vary in AC?

    <p>They vary continuously.</p> Signup and view all the answers

    Which of the following devices can generate a sinusoidal waveform?

    <p>Both mechanical rotating generator and electronic inverter or oscillator</p> Signup and view all the answers

    What is the point on a sine wave where the rate of change is maximum?

    <p>The zero crossing point</p> Signup and view all the answers

    What is the purpose of using a tangent line on a sine wave curve?

    <p>To visualize the varying gradients along the curve</p> Signup and view all the answers

    What happens when a switch is initially closed in a DC circuit with an inductor?

    <p>There is no current flow initially</p> Signup and view all the answers

    What property of an inductor causes it to oppose a change in current?

    <p>Inductance</p> Signup and view all the answers

    In the context of LCR circuits, what does the term 'phase shift' refer to?

    <p>The time delay between the voltage and current waveforms</p> Signup and view all the answers

    What does the term 'lead' mean in the context of LCR circuits?

    <p>The current waveform leads the voltage waveform</p> Signup and view all the answers

    What does the term 'lag' mean in the context of LCR circuits?

    <p>The voltage waveform leads the current waveform</p> Signup and view all the answers

    In the diagram showing the DC circuit with an inductor, what is the purpose of the switch (S1)?

    <p>To initiate the change in current flow through the inductor</p> Signup and view all the answers

    What is the formula used to calculate the inductive reactance (XL) in a series LCR circuit?

    <p>XL = 2πfL</p> Signup and view all the answers

    What is the formula used to calculate the capacitive reactance (XC) in a series LCR circuit?

    <p>XC = 1/2πfC</p> Signup and view all the answers

    What is the formula used to calculate the total impedance (Z) in a series LCR circuit?

    <p>Z = √(R^2 + XEQ^2)</p> Signup and view all the answers

    What is the formula used to calculate the total circuit current (IT) in a series LCR circuit?

    <p>IT = V/Z</p> Signup and view all the answers

    How is the voltage drop across the resistor (VR) calculated in a series LCR circuit?

    <p>VR = IT × R</p> Signup and view all the answers

    What is the formula used to calculate the phase angle (θ) between the applied voltage and the total circuit current in a series LCR circuit?

    <p>θ = tan^-1((VC - VL)/VR)</p> Signup and view all the answers

    In a parallel LCR circuit, how does the current distribution differ from a series LCR circuit?

    <p>The current is different for each component in a parallel LCR circuit.</p> Signup and view all the answers

    What is the main difference between a series LCR circuit and a parallel LCR circuit?

    <p>The voltage drop across each component needs to be calculated separately in a series LCR circuit.</p> Signup and view all the answers

    What does the amplitude of the positive and negative alternations represent in an AC waveform?

    <p>The maximum value of the current in each direction</p> Signup and view all the answers

    What is the primary cause of the generation of a sinusoidal waveform in a simple AC generator?

    <p>The uniform rotation of the conductor through a magnetic field</p> Signup and view all the answers

    What is the main difference between AC and DC in terms of current flow?

    <p>AC flows first in one direction and then in the opposite direction, while DC flows in a constant direction</p> Signup and view all the answers

    What is the relationship between the rate of change of magnetic flux and the induced EMF in a conductor?

    <p>The induced EMF is proportional to the rate of change of magnetic flux</p> Signup and view all the answers

    What is the purpose of using a filter in an electrical circuit?

    <p>To remove unwanted frequencies from the signal</p> Signup and view all the answers

    What is the primary purpose of a three-phase AC generator?

    <p>To generate three separate phases of AC power with a 120° phase difference</p> Signup and view all the answers

    Which of the following waveforms is typically produced by the simplest and cheapest electronic oscillator?

    <p>Square wave</p> Signup and view all the answers

    What is the primary function of a filter in an electrical circuit?

    <p>To remove unwanted frequency components from a signal</p> Signup and view all the answers

    What is a distinguishing feature of alternating current (AC) signals?

    <p>They have equal areas enclosed above and below the time axis</p> Signup and view all the answers

    What is the main difference between a series LCR circuit and a parallel LCR circuit?

    <p>The current distribution is different</p> Signup and view all the answers

    Which type of waveform has equal rise and fall time periods?

    <p>Triangular wave</p> Signup and view all the answers

    What is the identifying feature of a sawtooth wave?

    <p>Different rise and fall times</p> Signup and view all the answers

    What is the simplest square wave generator mentioned in the text?

    <p>Switch: on and off</p> Signup and view all the answers

    How does a sawtooth wave differ from a triangular wave?

    <p>Unequal rise and fall times</p> Signup and view all the answers

    What happens to the period of a sine wave as the rpm (revolutions per minute) of a generator increases?

    <p>The period decreases</p> Signup and view all the answers

    At what speed can current computer processors operate using a PC clock?

    <p>$4.0$ GHz</p> Signup and view all the answers

    How is the number of cycles completed in one revolution related to the number of poles in a generator?

    <p>The number of cycles is twice the number of poles</p> Signup and view all the answers

    What is the peak-to-peak value of a sine wave?

    <p>The magnitude of the voltage or current between the peak positive and peak negative values</p> Signup and view all the answers

    What does the term 'instantaneous value' refer to in the context of a sine wave?

    <p>The value at any time on the sine wave, which can be anywhere from zero to peak value</p> Signup and view all the answers

    Which type of filter is used to restrict a sudden surge in current through a toroidal choke?

    <p>Low-pass filter</p> Signup and view all the answers

    What kind of wave is produced by processing a square wave with an integrator?

    <p>Triangular wave</p> Signup and view all the answers

    In electronics, how is integration achieved to produce a triangular wave?

    <p>Through charging and discharging capacitors</p> Signup and view all the answers

    When an AC sinusoidal voltage is applied across a resistor, what type of current will flow?

    <p>Sine wave current</p> Signup and view all the answers

    How is integration conceptually achieved in mathematics?

    <p>Through the use of calculus</p> Signup and view all the answers

    What mathematical function describes the relationship where one function is affected by another?

    <p>Integration</p> Signup and view all the answers

    What happens to the induced voltage as the armature rotates from 0° to 90° in a generator?

    <p>It builds up to a maximum positive value.</p> Signup and view all the answers

    What is the result of the armature cutting fewer lines of flux as it rotates from 90° to 180° in a generator?

    <p>Induced voltage decreases from a maximum positive value to zero.</p> Signup and view all the answers

    What defines one complete sequence of voltage or current change in an AC cycle?

    <p>From zero through a positive peak, back to zero, through a negative peak and back to zero again.</p> Signup and view all the answers

    What happens as the armature continues to rotate from 180° to 270° in a generator?

    <p>The conductors cut more and more lines of flux in the opposite direction, inducing voltage in the negative direction.</p> Signup and view all the answers

    In an AC cycle, what happens after voltage changes from a positive peak back through zero and then reaches a negative peak?

    <p>It goes back to zero before going through another positive peak.</p> Signup and view all the answers

    What parameter needs to be calculated for each component in a parallel LCR circuit?

    <p>Reactance</p> Signup and view all the answers

    What is the purpose of determining branch currents in a parallel LCR circuit?

    <p>To find the current through each component</p> Signup and view all the answers

    How can the total circuit impedance be calculated in a parallel LCR circuit?

    <p>By using Ohm's law</p> Signup and view all the answers

    What type of diagram aids in determining whether a parallel LCR circuit is inductive or capacitive?

    <p>Phasor diagram</p> Signup and view all the answers

    In a parallel LCR circuit, where does the supply voltage appear?

    <p>Across all components</p> Signup and view all the answers

    What are the four main parameters required to analyze a parallel LCR circuit?

    <p>Reactance, branch currents, total circuit current, phase angle</p> Signup and view all the answers

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