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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
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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.

Last edited by jim.carroll. Register to edit

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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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