Electricity 205: Conductors, Resistors, and Electric Current
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Questions and Answers

If a wire of length $l$ and cross-sectional area $A$ has a resistance of $4 \Omega$, what is the resistance of another wire of the same material with length $l/2$ and cross-sectional area $2A$?

  • $1 \Omega$ (correct)
  • $0.5 \Omega$
  • $4 \Omega$
  • $2 \Omega$

    • According to the given text, what is the resistivity of manganese at 20°C?

  • $1.84 \times 10^{-6} \Omega \text{m}$ (correct)
  • $1.84 \times 10^{-5} \Omega \text{m}$
  • $1.84 \times 10^{-7} \Omega \text{m}$
  • $1.84 \times 10^{-8} \Omega \text{m}$

    • Which of the following factors does NOT affect the resistance of a conductor?

  • Length of the conductor
  • Cross-sectional area of the conductor
  • Temperature of the conductor
  • Color of the conductor (correct)

    • If the potential difference across an electrical component decreases to half of its former value, and its resistance remains constant, what happens to the current through it?

    <p>The current halves</p> Signup and view all the answers

    Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?

    <p>Alloys have a higher melting point than pure metals, which is desirable for heating elements.</p> Signup and view all the answers

    If the resistivity of a material is low, what can be inferred about its ability to conduct electricity?

    <p>It is a good conductor of electricity.</p> Signup and view all the answers

    Which of the following statements is correct regarding the flow of current through a thick wire versus a thin wire of the same material?

    <p>Current flows more easily through a thick wire because it has lower resistance.</p> Signup and view all the answers

    Which of the following materials is the best conductor, according to the data in Table 12.2?

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

    If the resistance of a conductor increases, what happens to the current flowing through it, assuming the potential difference remains constant?

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

    Which of the following statements is true regarding the relationship between resistance and temperature for metallic conductors?

    <p>Resistance increases with increasing temperature.</p> Signup and view all the answers

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