Measuring Filament Resistance
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Questions and Answers

What is the smallest part of an element or compound that normally exists in a free state?

  • Compound
  • Atom
  • Element
  • Molecule (correct)

    • What is the ultimate particle to which an element can be reduced to?

  • Compound
  • Element
  • Molecule
  • Atom (correct)

    • How many elements occur naturally?

  • 50
  • 75
  • 100
  • 92 (correct)

    • What is formed when 2 or more atoms of different elements combine?

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

    What is made up of 2 hydrogen atoms and one oxygen atom?

    <p>Compound of water</p> Signup and view all the answers

    What consists of one or more atoms of that element?

    <p>Molecule of an element</p> Signup and view all the answers

    What can only combine to form compounds in certain fixed proportions?

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

    What is the case with many substances met in everyday life?

    <p>They are mixtures of elements or compounds</p> Signup and view all the answers

    What is an example of an application of electromagnetism principles?

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

    What is the prefix for 103?

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

    What is the unit represented by the symbol 'μ'?

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

    What is the effect of increasing current flow on the magnetic field?

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

    What is the term for 10-6?

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

    What is the effect of high current flow on the filament of a light bulb?

    <p>It glows white hot</p> Signup and view all the answers

    How would you express 35 milli-amperes in terms of amperes?

    <p>35 x 10^(-3) A</p> Signup and view all the answers

    What is the term for 10^3?

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

    What is the primary characteristic of a semiconductor?

    <p>It can switch between conducting and non-conducting states without damage.</p> Signup and view all the answers

    What is the force used to switch semiconductors?

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

    What is the definition of static electricity?

    <p>Electricity that is standing still, or voltage potential with no electron flow</p> Signup and view all the answers

    What is the relationship between the force between two point charges and the distance between them, according to Coulomb's Law?

    <p>The force between two point charges varies inversely with the distance between them.</p> Signup and view all the answers

    What is the primary reason why atoms are said to attract each other?

    <p>Because they have unlike charges</p> Signup and view all the answers

    What is the purpose of using silicon and germanium in semiconductor materials?

    <p>To allow the material to switch between conducting and non-conducting states</p> Signup and view all the answers

    What is the primary mechanism behind a cell?

    <p>The use of two different metals placed in a liquid called an electrolyte</p> Signup and view all the answers

    What is the term for the electrical charge acquired by an object, such as a comb, when it is rubbed against another object, such as hair?

    <p>Static electricity</p> Signup and view all the answers

    What is the purpose of a thermocouple?

    <p>To measure the temperature difference between two junctions</p> Signup and view all the answers

    What is the name of the effect that occurs when a quartz crystal is mechanically deformed, resulting in an electrical potential difference between its opposite faces?

    <p>Piezoelectric effect</p> Signup and view all the answers

    What is the term for the devices that utilize the energy from a light source to produce electricity?

    <p>Photovoltaic cells</p> Signup and view all the answers

    What is the primary cause of static electricity buildup on an aircraft in flight?

    <p>Friction between the aircraft's metal body and the atmosphere</p> Signup and view all the answers

    What is the name of the scientist who discovered the thermoelectric effect?

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

    What is the term for a group of cells that produce a battery?

    <p>Battery pack</p> Signup and view all the answers

    How can the resistance of the lamp be obtained?

    <p>By dividing the voltmeter reading by the ammeter reading</p> Signup and view all the answers

    What happens to the resistance of the filament as the temperature increases?

    <p>It increases</p> Signup and view all the answers

    What is the temperature coefficient of resistance of pure metals like copper, iron, and tungsten?

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

    What happens to the resistance of carbon, electrolytes, and insulating materials as the temperature increases?

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

    What is the characteristic of the resistance of certain alloys like manganin?

    <p>It remains constant with temperature</p> Signup and view all the answers

    What is the resistance of the lamp at normal working temperature compared to when it is cold?

    <p>It is 10 times</p> Signup and view all the answers

    What is the temperature at which the resistance of the copper wire was measured?

    <p>2000°C</p> Signup and view all the answers

    What is the value of the resistance of the copper wire at 0°C?

    <p>1 ohm</p> Signup and view all the answers

    Study Notes

    Electron Theory

    • Matter is composed of elements, which are the building blocks of all substances
    • Elements can exist alone or combined to form compounds
    • The smallest part of an element or compound that exists in a free state is called a molecule
    • Molecules can consist of one or more atoms of the same element
    • Compounds consist of two or more different elements

    Structure of Matter

    • Atoms are the ultimate particles of an element
    • Many elements cannot exist in a stable form as individual atoms, but only in groups of atoms
    • The properties of a substance depend on the arrangement of its atoms

    Conduction

    • Atoms attract each other, with like charges repelling and unlike charges attracting
    • Static electricity is a force created by the attraction of unlike charges
    • Coulomb's Law states that the force between two point charges varies inversely as the square of the distance between them and directly with the magnitude of charge

    Chemical Action (Cell)

    • A cell is formed by placing two different metals in a liquid called an electrolyte
    • Grouping these cells together produces a battery

    Fricton (Static Electricity)

    • Static electricity is demonstrated by rubbing a silk cloth over a glass rod, which creates a stationary or "at rest" charge
    • Aircraft in flight build up large amounts of static electricity due to friction, which can be undesirable but unavoidable

    Pressure (Crystal Controlled Oscillators)

    • Certain crystalline substances, like quartz, exhibit a piezoelectric effect, resulting in a potential difference between opposite faces of the crystal when mechanically deformed
    • The crystal can be shown to have an 'electrical' equivalent circuit

    Light (Photovoltaic Cells)

    • Photovoltaic cells use energy from a light source to produce electricity
    • These devices can be used to power battery chargers when connected as solar panels

    Heat (Thermocouple)

    • When two different metals are placed in contact, an electrical potential difference exists, depending on the temperature of the junction
    • This thermoelectric effect is called the Seebeck effect, and the junction is called a 'thermocouple'

    Electromagnetism

    • When current flows, a small magnetic field is created, and the higher the current flow, the stronger the magnetic field
    • Electromagnetic principles are used in alternators, ignition systems, and other electronic devices

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    Description

    This quiz is about measuring the resistance of a lamp by varying the filament temperature and voltage. It covers the relationship between voltage, current, and resistance.

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