Solar Energy and Renewable Resources
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Questions and Answers

What is the maximum open circuit voltage that a single-junction silicon solar cell can produce?

  • 0.9V to 1.0V
  • 0.3V to 0.4V
  • 0.7V to 0.8V
  • 0.5V to 0.6V (correct)

    • Why are organic devices well suited to meet the needs of both the electronics and energy industries?

  • They can only be adapted to a limited range of applications
  • Their manufacturing does not require expensive processing steps (correct)
  • They are not suitable for energy storage
  • They require expensive processing steps

    • What is the main advantage of using solar energy as a source of electricity?

  • It is a non-depleting, clean source of energy (correct)
  • It is a depleting source of energy
  • It is a noisy source of energy
  • It is a non-renewable source of energy

    • What are the main components of the first generation of solar cells?

    <p>Single crystals grown on Si wafers</p> Signup and view all the answers

    What is the role of solar cells in alleviating the world's energy problems?

    <p>To reduce our dependence on non-renewable sources of energy</p> Signup and view all the answers

    What has been the trend in solar cell manufacturing over the years?

    <p>A range of improvements</p> Signup and view all the answers

    What is the primary application of soft magnetic materials?

    <p>Construction of cores of electrical rotating machines</p> Signup and view all the answers

    What is the reason behind the motionless domain walls in hard magnetic materials?

    <p>Presence of crystal defects and imperfections</p> Signup and view all the answers

    What is the characteristic of hard magnetic materials that makes them difficult to magnetize and demagnetize?

    <p>High coercivity and retentivity</p> Signup and view all the answers

    What is the term used to describe the phenomenon where the magnetization of ferromagnetic materials lags behind the magnetic field?

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

    What is the application of hard magnetic materials in automotive systems?

    <p>Motor drives for fans and wipers</p> Signup and view all the answers

    What is the significance of hysteresis loop area in hard magnetic materials?

    <p>It represents the energy loss per cycle</p> Signup and view all the answers

    What is a characteristic of piezoelectric generators that enables them to generate a significant amount of power?

    <p>High power density</p> Signup and view all the answers

    What factor influences the efficiency of energy conversion in piezoelectric generators?

    <p>Frequency and amplitude of mechanical vibrations</p> Signup and view all the answers

    At what frequency do piezoelectric generators operate most efficiently?

    <p>Specific frequencies that match their resonant frequency</p> Signup and view all the answers

    What is a potential future application of piezoelectric generators?

    <p>Powering small electronic devices in remote locations</p> Signup and view all the answers

    What is the goal of ongoing research in piezoelectric generators?

    <p>To improve the efficiency and scalability of piezoelectric generators</p> Signup and view all the answers

    What is being explored to enhance power generation in piezoelectric generators?

    <p>Integration with other energy harvesting technologies</p> Signup and view all the answers

    What is the primary source of electric dipole moments in BaTiO3 and PZTs?

    <p>Ions on crystal lattice sites with asymmetric charge surroundings</p> Signup and view all the answers

    What is the unit of measurement for dipole density or polarization?

    <p>C·m/m3</p> Signup and view all the answers

    What is the purpose of poling in piezoelectric materials?

    <p>To align the dipole moments and create a strong electric field</p> Signup and view all the answers

    What is the effect of mechanical stress on piezoelectric materials?

    <p>It changes the polarization P</p> Signup and view all the answers

    What is the relation between dipoles near each other in piezoelectric materials?

    <p>They are aligned in regions called Weiss domains</p> Signup and view all the answers

    What is the condition for the manifestation of piezoelectricity?

    <p>The change of polarization P when applying a mechanical stress</p> Signup and view all the answers

    What is the advantage of RGB LED in terms of its physical properties?

    <p>It occupies less area and is small in size</p> Signup and view all the answers

    What is the fundamental law that states the relationship between power, current, and voltage?

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

    What is the main disadvantage of RGB LED in terms of manufacturing?

    <p>The cost of manufacturing is high</p> Signup and view all the answers

    What is the algebraic sum of all the currents entering and leaving a node according to Kirchhoff's Current Law?

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

    What is the disadvantage of RGB LED in terms of color?

    <p>Dispersion of color</p> Signup and view all the answers

    What is the relationship between voltage and current according to Ohm's Law?

    <p>I = V / R</p> Signup and view all the answers

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