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Subel. ZLB
20 questions
Subelement ZLB

Basic Electrical Theory

Section ZLB03

Electronics Fundamentals

The element Silicon is

  • a conductor
  • an insulator
  • a superconductor
  • Correct Answer
    a semiconductor
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An element which falls somewhere between being an insulator and a conductor is called a

  • P-type conductor
  • intrinsic conductor
  • Correct Answer
    semiconductor
  • N-type conductor
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In an atom

  • the protons and the neutrons orbit the nucleus in opposite directions
  • the protons orbit around the neutrons
  • Correct Answer
    the electrons orbit the nucleus
  • the electrons and the neutrons orbit the nucleus
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An atom that loses an electron becomes

  • Correct Answer
    a positive ion
  • an isotope
  • a negative ion
  • a radioactive atom
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An electric current passing through a wire will produce around the conductor

  • an electric field
  • Correct Answer
    a magnetic field
  • an electrostatic field
  • nothing
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These magnetic poles repel

  • unlike
  • Correct Answer
    like
  • positive
  • negative
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A common use for a magnet is in

  • Correct Answer
    A computer speaker
  • An optical mouse
  • A keyboard
  • A magnetic loop antenna
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The better conductor of electricity is

  • Correct Answer
    copper
  • carbon
  • silicon
  • aluminium
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The term describing opposition to electron flow in a metallic circuit is

  • current
  • voltage
  • Correct Answer
    resistance
  • power
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The substance which will most readily allow an electric current to flow is

  • an insulator
  • Correct Answer
    a conductor
  • a resistor
  • a dielectric
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The plastic coating formed around wire is

  • Correct Answer
    an insulator
  • a conductor
  • an inductor
  • a magnet
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The following is a source of electrical energy

  • p-channel FET
  • carbon resistor
  • germanium diode
  • Correct Answer
    lead acid battery
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An important difference between a common torch battery and a lead acid battery is that only the lead acid battery

  • has two terminals
  • contains an electrolyte
  • Correct Answer
    can be re-charged
  • can be effectively discharged
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As temperature increases, the resistance of a metallic conductor

  • Correct Answer
    increases
  • decreases
  • remains constant
  • becomes negative
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In an n-type semiconductor, the current carriers are

  • holes
  • Correct Answer
    electrons
  • positive ions
  • photons

Correct answer: electrons

In an n-type semiconductor, impurities are added that provide extra electrons to the crystal structure.

These free electrons are able to move through the material and act as the majority charge carriers responsible for current flow.

  • Holes are the majority carriers in p-type material.
  • Positive ions are fixed in the lattice and do not move.
  • Photons are not charge carriers.

Therefore, the current carriers in an n-type semiconductor are electrons.

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In a p-type semiconductor, the current carriers are

  • photons
  • electrons
  • positive ions
  • Correct Answer
    holes

Correct answer: holes

In a p-type semiconductor, impurities are added that create a deficiency of electrons in the crystal structure.

These missing electrons are called holes, which behave as positive charge carriers and move through the material as nearby electrons fill the gaps.

  • Photons are not charge carriers.
  • Electrons are the majority carriers in n-type material.
  • Positive ions are fixed in the crystal lattice and do not move.

Therefore, the current carriers in a p-type semiconductor are holes.

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An electrical insulator

  • lets electricity flow through it in one direction
  • Correct Answer
    does not let electricity flow through it
  • lets electricity flow through it when light shines on it
  • lets electricity flow through it
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Four good electrical insulators are

  • plastic, rubber, wood, carbon
  • glass, wood, copper, porcelain
  • paper, glass, air, aluminium
  • Correct Answer
    glass, air, plastic, porcelain
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Three good electrical conductors are

  • copper, gold, mica
  • gold, silver, wood
  • Correct Answer
    gold, silver, aluminium
  • copper, aluminium, paper
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The name for the flow of electrons in an electric circuit is

  • voltage
  • resistance
  • capacitance
  • Correct Answer
    current
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