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. (A)</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 (C)</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 (D)</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 (D)</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 (C)</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 (A)</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 (B)</p> Signup and view all the answers

What is the formula for the resistivity of a body?

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

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