Electrostatic Voltages and Generation Quiz
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Questions and Answers

In a circuit with a steady EMF, what happens to the current when the resistance is doubled?

  • The current is halved (correct)
  • The current is quadrupled
  • The current is doubled
  • The current remains the same

    • What does the voltage between two bodies measure?

  • The difference in potential between the two bodies (correct)
  • The average potential of the two bodies
  • The resistance of the two bodies
  • The sum of the potential of the two bodies

    • What is the unit of electrical resistance?

  • Ampere
  • Volt
  • Farad
  • Ohm (correct)

    • How does the resistance of a conductor change with its length and cross-sectional area?

    <p>Resistance is directly proportional to length and inversely proportional to cross-sectional area</p> Signup and view all the answers

    What is the purpose of a Wheatstone Bridge?

    <p>To measure the resistance of a material</p> Signup and view all the answers

    What is the relationship between magnetic flux density and magnetic materials?

    <p>Magnetic materials conduct magnetic flux easily</p> Signup and view all the answers

    What is the role of the Commutator in a DC motor?

    <p>To control the direction of current flow in the motor's armature</p> Signup and view all the answers

    How does the distance between plates affect the capacitance of a capacitor?

    <p>Increasing the distance decreases capacitance</p> Signup and view all the answers

    What is the function of Thermocouples in electrical systems?

    <p>To convert thermal energy to electrical energy</p> Signup and view all the answers

    What is the measure of the force or pressure applied to electrons to remove them from their orbits and propel them along a wire?

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

    In which direction is current flow understood to occur?

    <p>From negative to positive</p> Signup and view all the answers

    What does a statement that 12 volts are being applied to a circuit indicate?

    <p>The electromotive force propelling the electrons</p> Signup and view all the answers

    What happens to the current when the voltage driving it through the circuit is doubled?

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

    What is denoted with reference to a point (e.g. +100 V with reference to 0 V)?

    <p>Potential difference</p> Signup and view all the answers

    What is the term for Edison's application of causing electrons to flow across the space between the filament and the plate?

    <p>Thermionic emission</p> Signup and view all the answers

    Why did Edison's bulb have a vacuum around the filament?

    <p>To prevent the filament from burning</p> Signup and view all the answers

    What happens to free electrons in metallic conductors as the temperature increases?

    <p>They become more agitated and move faster</p> Signup and view all the answers

    What would have happened if the electrons had to be forcibly pulled from a cold filament?

    <p>The filament would have been destroyed</p> Signup and view all the answers

    What is the process similar to when some of the free electrons escape from the conductor's surface due to high agitation?

    <p>Boiling water</p> Signup and view all the answers

    What force opposes the centrifugal force and holds the electrons in a specific orbit?

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

    What is the movement of electrons called when other free electrons move to fill the space vacated by the first free electron?

    <p>Electron flow</p> Signup and view all the answers

    What is an atom called if it has too many electrons?

    <p>Negatively charged ion</p> Signup and view all the answers

    What determines the amount of energy it takes for an atom to become negatively or positively charged?

    <p>Electrons in valence band</p> Signup and view all the answers

    According to the triboelectric series, what happens to materials lower in the series?

    <p>They become negatively charged</p> Signup and view all the answers

    What can be predicted about the voltage levels generated when two materials close together in the triboelectric series are rubbed together?

    <p>They will produce low voltage</p> Signup and view all the answers

    How does the relative humidity affect electrostatic voltages according to the provided data?

    <p>Higher humidity leads to lower voltages</p> Signup and view all the answers

    What did Charles A. Coulomb discover and write about in the 1780s?

    <p>Relationship between attracting or repelling charged bodies</p> Signup and view all the answers

    What is the process of forcing a cathode to release electrons either by heating it up or using a high voltage to strip electrons out of it called?

    <p>Thermionic emission</p> Signup and view all the answers

    Why is conduction of current in a vacuum much more difficult to achieve?

    <p>Due to the absence of gas molecules that can liberate free electrons</p> Signup and view all the answers

    What is necessary for electrons to pass from the cathode to the anode in a thermionic valve?

    <p>Electrostatic attraction</p> Signup and view all the answers

    What type of potential is commonly present at the anode in TV sets?

    <p>High positive potential</p> Signup and view all the answers

    What is the method of releasing electrons from a cathode by heating it called?

    <p>Thermionic emission</p> Signup and view all the answers

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