Resistance and Ohm's Law in Electrical Circuits
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Questions and Answers

Which element cannot be analyzed using Ohm’s law?

  • Transistors
  • Electronic tubes
  • Capacitors
  • Resistors (correct)

    • What property of a substance opposes the flow of electric current?

  • Voltage
  • Current
  • Resistance (correct)
  • Power

    • What is the unit of resistance?

  • Watt
  • Ampere
  • Ohm (correct)
  • Volt

    • In Ohm's law, what does 'R' stand for?

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

    Which components are not bilateral and hence not suitable for Ohm's law analysis?

    <p>Electronic tubes</p> Signup and view all the answers

    What causes the opposition to the flow of charges in electrical conductors?

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

    What is the relationship between the resistance (R) of a conductor and its length (l)?

    <p>R is directly proportional to l when temperature and cross-sectional area are constant</p> Signup and view all the answers

    What is the relationship between the resistance (R) of a conductor and its cross-sectional area (A)?

    <p>R is inversely proportional to A when temperature and length are constant</p> Signup and view all the answers

    What is the constant of proportionality ρ (rho) in the equation R = ρ(l/A)?

    <p>Resistivity or specific resistance of the conductor</p> Signup and view all the answers

    If the length of a conductor is 1 m and its cross-sectional area is 1 m^2, what is the resistance of the conductor?

    <p>R = ρ (ohm)</p> Signup and view all the answers

    What is the unit of resistivity (ρ) in the SI system?

    <p>ohm-meter (ohm-m)</p> Signup and view all the answers

    What does the resistivity (ρ) of a material depend on?

    <p>Nature of the material and temperature</p> Signup and view all the answers

    What is the definition of 1 ohm?

    <p>The resistance of a conductor is one ohm if one-ampere current flows through it under a potential difference of one volt.</p> Signup and view all the answers

    What is the relationship between 1 ohm, 1 volt, and 1 ampere?

    <p>$1 \ohm = 1 \volt / 1 \ampere$</p> Signup and view all the answers

    What is the resistance of a conductor measured in when it is high?

    <p>Kiloohm and megaohm</p> Signup and view all the answers

    What happens to the resistance of a bismuth wire when it is placed in a magnetic field?

    <p>The resistance decreases by about 50%.</p> Signup and view all the answers

    What happens to the resistance of selenium when it is exposed to light?

    <p>The resistance decreases.</p> Signup and view all the answers

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