Electrical Fundamentals II: Inductance & Inductor
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Questions and Answers

What happens to the induced voltage in the second coil when the magnetic force is increased?

  • It remains the same.
  • It increases. (correct)
  • It decreases.
  • It becomes negative.

    • What effect does increasing the number of turns in the primary coil have on the back EMF?

  • It increases the back EMF. (correct)
  • It has no effect on the back EMF.
  • It decreases the back EMF.
  • It causes the back EMF to fluctuate.

    • To double the voltage in the primary wire, what must happen to the applied voltage?

  • It may need to triple. (correct)
  • It needs to remain constant.
  • It needs to halve.
  • It must be lowered.

    • What is the relationship between current in the secondary circuit and the primary magnetic field?

    <p>The secondary current opposes the primary magnetic field.</p> Signup and view all the answers

    What must be done to increase the current flow in the primary wire?

    <p>Increase the applied voltage.</p> Signup and view all the answers

    What occurs when a load is added to the output in the transformer?

    <p>Current flows in the secondary circuit.</p> Signup and view all the answers

    What happens to the induced voltage when the primary current increases?

    <p>The induced voltage increases.</p> Signup and view all the answers

    Which of the following describes mutual inductance?

    <p>The ability of one coil to influence another through a changing magnetic field.</p> Signup and view all the answers

    What is the main factor affecting the magnitude of the induced voltage in a conductor moving through a magnetic field?

    <p>Rate of change of magnetic flux</p> Signup and view all the answers

    Which law describes the direction of induced EMF related to the change in magnetic flux?

    <p>Lenz's Law</p> Signup and view all the answers

    What effect does increasing the number of turns in a coil have on mutual inductance?

    <p>Increases mutual inductance</p> Signup and view all the answers

    What happens to the induced EMF when a magnet is held stationary near a coil?

    <p>It becomes zero</p> Signup and view all the answers

    How does the physical size of a coil affect mutual inductance?

    <p>Larger size can increase mutual inductance</p> Signup and view all the answers

    What does the term 'saturation point' refer to in the context of inductors?

    <p>Point where inductance ceases</p> Signup and view all the answers

    Which of the following describes back EMF?

    <p>The induced voltage opposing the change in current</p> Signup and view all the answers

    What does Faraday’s Law state regarding induced EMF?

    <p>It is proportional to the rate of change of magnetic flux.</p> Signup and view all the answers

    What is meant by mutual induction in electrical circuits?

    <p>Induction of voltage between two separate coils</p> Signup and view all the answers

    Which factors influence the induced voltage in a conductor moving in a magnetic field?

    <p>Magnetic field strength and rate of flux change</p> Signup and view all the answers

    What happens to the back electromotive force (BEMF) in the primary coil when the total flux is reduced?

    <p>BEMF decreases, allowing current to increase.</p> Signup and view all the answers

    How does the positioning of two coils affect mutual inductance?

    <p>Close positioning yields a high mutual inductance.</p> Signup and view all the answers

    Which condition results in zero mutual inductance between two coils?

    <p>When coils are positioned perpendicularly.</p> Signup and view all the answers

    What factor does NOT influence mutual inductance between two coils?

    <p>Type of electrical material used in the coils</p> Signup and view all the answers

    Which action will increase the electromotive force (EMF) induced in the secondary coil?

    <p>Increasing the magnetic field strength.</p> Signup and view all the answers

    What does the coefficient of coupling between two coils measure?

    <p>The ratio of flux cutting through one coil to the flux generated in the other coil.</p> Signup and view all the answers

    How can the mutual inductance be maximized?

    <p>By using an iron core shared by both coils.</p> Signup and view all the answers

    Which combination of factors would likely lead to the lowest mutual inductance between two coils?

    <p>Coils positioned perpendicularly with low turns and small size.</p> Signup and view all the answers

    What is the relationship between the speed of the coil and the induced motional emf?

    <p>The induced emf is directly proportional to the speed of the coil.</p> Signup and view all the answers

    According to Lenz's Law, what happens when the magnetic flux is increasing?

    <p>The induced field opposes the increase in magnetic flux.</p> Signup and view all the answers

    What happens to inductance when a material is magnetically saturated?

    <p>Inductance remains constant regardless of changes</p> Signup and view all the answers

    What is the effect of switching the current on and off in a coil on the magnetic field?

    <p>The magnetic field builds up and collapses.</p> Signup and view all the answers

    What is the significance of the coefficient of coupling K in mutual inductance?

    <p>It determines how much flux from one coil cuts through the other coil</p> Signup and view all the answers

    Which rule is used to determine the direction of the magnetic field around a conductor?

    <p>Left-Hand Rule for Electron Flow.</p> Signup and view all the answers

    How does the magnetic field strength change with increasing electric current in a wire?

    <p>The magnetic field strength increases.</p> Signup and view all the answers

    Which statement correctly describes the unit of mutual inductance?

    <p>One henry induces one volt by a change of one ampere per second.</p> Signup and view all the answers

    In the mutual inductance equation, what does M represent?

    <p>Mutual inductance in henrys</p> Signup and view all the answers

    What occurs in an electromagnetic induction process when the current in a coil varies?

    <p>An emf is induced in a nearby stationary conductor.</p> Signup and view all the answers

    What is the main outcome when the induced current flows?

    <p>It opposes the change in magnetic flux that produced it.</p> Signup and view all the answers

    What does the symbol 'L' represent in electrical circuits?

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

    What characterizes inductance in an electrical circuit?

    <p>It opposes changes in current</p> Signup and view all the answers

    Which statement about the relationship between magnetic field direction and current direction is true?

    <p>The magnetic field direction is determined by the direction of the electrical current.</p> Signup and view all the answers

    How is mutual inductance calculated between two coils L1 and L2?

    <p>M = K * L1 * L2</p> Signup and view all the answers

    What is indicated by a coefficient of coupling K equal to 0.5?

    <p>Only half of the flux from one coil effectively links the other.</p> Signup and view all the answers

    How does the number of turns in a coil affect its inductance?

    <p>Inductance varies as the square of the number of turns.</p> Signup and view all the answers

    Which statement is true regarding the effect of coil diameter on inductance?

    <p>Doubling the diameter increases inductance by a factor of 4.</p> Signup and view all the answers

    What is the impact of coil length on inductance while keeping the number of turns constant?

    <p>Doubling the length of the coil will halve the inductance.</p> Signup and view all the answers

    How does the core material affect the inductance of a coil?

    <p>Inductance increases with higher permeability of core material.</p> Signup and view all the answers

    What advantage does adding layers to a coil provide?

    <p>It increases the number of flux loops and improves flux linkage.</p> Signup and view all the answers

    What is the relationship between spacing of coil turns and inductance?

    <p>Tightly spaced turns result in increased flux linkage and higher inductance.</p> Signup and view all the answers

    Which coil is likely to have the highest inductance?

    <p>A coil with tightly spaced turns and two layers.</p> Signup and view all the answers

    What effect does a non-magnetic core have on a coil's inductance?

    <p>It significantly decreases inductance compared to a magnetic core.</p> Signup and view all the answers

    Study Notes

    Module 3: Electrical Fundamentals II - Topic 3.11: Inductance and Inductor

    • This topic covers inductance and inductors
    • Learning objectives include stating Faraday's Law, describing voltage induction in conductors moving in magnetic fields, describing induction principles, the effects of magnetic field strength, rate of flux change, and conductor turns on induced voltage, and mutual induction
    • The module also details the effect of primary current changes and mutual inductance on induced voltage
    • Factors affecting mutual inductance include number of turns in each coil, physical size of coils, permeability of coils, and position of coils relative to each other
    • Lenz's law, back EMF, and self-induction are discussed
    • Saturation points of inductors are explained
    • Additional information details the principle uses of inductors
    • Faraday's Law of Induction details the relationship between induced voltage and the rate of magnetic flux change
    • Basic inductor operation: voltage is induced across a conductor in a changing magnetic field
    • If a magnet moves in, an EMF is induced, with no current if the magnet is stationary, and induced EMF is in the opposite direction when the magnet moves out
    • Faraday's Law expresses average EMF induced as E= -N * ΔΦ / Δt
    • E = Electromotive force (EMF), N = number of turns, ΔΦ = rate of change of magnetic flux, Δt= time interval
    • Mutual inductance describes how magnetic flux from one conductor induces EMF in another electrically isolated conductor
    • Transformers use this principle
    • Primary current affects induced voltage because changing magnetic field in one coil can induce voltage in another; increasing the number of turns increases back EMF
    • Positioning of coils affects mutual inductance; close coils have higher mutual inductance compared to coils far apart
    • Perpendicular coils have no mutual inductance
    • Mutual inductance is dependent on factors including number of turns, physical size, permeability, and positioning of coils
    • Magnetic saturation occurs when material cannot be further magnetized, so increasing primary current won't increase induced EMF in the secondary circuit
    • Inductance opposes current changes (similar to inertia opposing changes in velocity)
    • Increasing inductance involves forming the conductor into a loop or coil, increasing flux linkage through coil expansion and affecting loops, and using magnetic core materials with high permeability
    • Inductors can be connected in series or parallel (similar to resistors)
    • In a purely inductive circuit, current lags voltage by 90 degrees and the current/voltage relationship is described by graphs. The time constant LR is described and is similar to RC circuit, relating inductance (L) and resistance (R) for inductor to increase to 63.2 % of maximum and how a time constant relates to 100%.

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    B - B - 3.11 - Inductance Inductor PDF

    Description

    This quiz explores the concepts of inductance and inductors, focusing on Faraday's Law and voltage induction in conductors within magnetic fields. It examines mutual induction, factors affecting it such as coil size and number of turns, and principles like Lenz's law and self-induction. Assess your understanding of how these concepts apply to practical electrical systems.

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