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Resistnace/Circuits MCQ 2
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Resistnace/Circuits MCQ 2

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Questions and Answers

What is the relationship between the voltage and current in high voltage power lines according to Joule's law?

  • The voltage is inversely proportional to the current.
  • The heat produced is proportional to the current, while the voltage remains constant.
  • The voltage is directly proportional to the current.
  • The heat produced is proportional to the square of the current, while the voltage remains constant. (correct)

    • Which of the following statements is true about circuits?

  • In a series circuit, the current is the same at every point along the wire, but different size currents can flow through parallel parts.
  • In a series circuit, the current is the same at every point along the wire, and the same size current flows through parallel parts.
  • In a series circuit, different size currents can flow through parallel parts, and the current at the junction entering and exiting the parallel parts is the same. (correct)
  • In a series circuit, the current is different at every point along the wire, but the same size current flows through parallel parts.

    • What is the relationship between resistance and power in a resistor according to Ohm's Law?

  • The power is directly proportional to the resistance.
  • The power is inversely proportional to the square of the resistance.
  • The power is inversely proportional to the resistance. (correct)
  • The power is directly proportional to the square of the resistance.

    • What happens to the electrical energy as it flows through a material?

    <p>The material heats up.</p> Signup and view all the answers

    What is the relationship between the resistivity of a circular wire and its diameter?

    <p>Resistivity is directly proportional to the square of the wire's diameter</p> Signup and view all the answers

    What happens to the resistance of a metal as the temperature increases?

    <p>The resistance increases as temperature increases</p> Signup and view all the answers

    What is the formula for the total resistance of two resistors connected in series?

    <p>RT = R1 + R2</p> Signup and view all the answers

    What is the relationship between the sum of currents entering a point in a parallel circuit and the sum of currents leaving it?

    <p>The sum of the currents entering a point in a parallel circuit is equal to the sum of the currents leaving it</p> Signup and view all the answers

    What is the relationship between the potential difference of a full circuit and the sum of all potential differences in the circuit?

    <p>The potential difference of a full circuit is equal to the sum of all potential differences in the circuit</p> Signup and view all the answers

    What is the formula for the total resistance of two resistors connected in parallel?

    <p>1/RT = 1/R1 + 1/R2</p> Signup and view all the answers

    What is the formula for the resistivity of a body?

    <p>ρ = R x A / l</p> Signup and view all the answers

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