Gr 9 NATURAL SCIENCES: CH 3.3 Factors that affect resistors

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Questions and Answers

What is the primary function of resistance in an electric circuit?

  • To generate electricity
  • To oppose the flow of electrons (correct)
  • To facilitate the flow of electrons
  • To regulate the flow of current

What is the primary reason for longer conductors having more resistance?

  • The electrons encounter more collisions as they travel through the conductor (correct)
  • The electrons travel faster through the conductor
  • The electrons have a higher kinetic energy
  • The electrons are attracted to the conductor

Which of the following factors does not affect the resistance of a conductor?

  • Type of material
  • Thickness of the conductor
  • Electric current (correct)
  • Length of the conductor

A conductor with a higher resistivity is a good:

<p>Insulator (D)</p> Signup and view all the answers

What is the effect of increasing the temperature of a conductor on its resistance?

<p>The resistance increases (B)</p> Signup and view all the answers

What is the purpose of coiling the tungsten wire in an incandescent light bulb?

<p>To increase the resistance of the filament (A)</p> Signup and view all the answers

Which of the following statements is false about the effect of thickness on resistance?

<p>Thicker wires have higher resistance (D)</p> Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor on its resistance?

<p>The resistance decreases (C)</p> Signup and view all the answers

What is the formula to calculate the resistance of a conductor?

<p>R = ρL/A (B)</p> Signup and view all the answers

What is the formula for calculating the resistance of a conductor?

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

Which factor affects the resistance of a conductor the most?

<p>Type of material (D)</p> Signup and view all the answers

What happens to the resistance of a conductor when its length is increased?

<p>It increases (D)</p> Signup and view all the answers

Which of the following materials has a low resistance?

<p>Copper (A)</p> Signup and view all the answers

What happens to the resistance of a conductor as its length increases?

<p>The resistance increases (C)</p> Signup and view all the answers

What is the term for the ability of a material to conduct electricity?

<p>Resistivity (C)</p> Signup and view all the answers

Why is copper a better conductor than iron?

<p>Because it has a lower resistivity (A)</p> Signup and view all the answers

What is the effect of decreasing the temperature of a conductor on its resistance?

<p>The resistance decreases (A)</p> Signup and view all the answers

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

<p>A larger cross-sectional area results in a lower resistance (C)</p> Signup and view all the answers

Why do shorter conductors have lower resistance?

<p>Shorter conductors have fewer collisions (C)</p> Signup and view all the answers

What is the main factor affecting the resistance of a conductor?

<p>Type of material (A)</p> Signup and view all the answers

What happens to the resistance of a conductor when its cross-sectional area is decreased?

<p>It increases (C)</p> Signup and view all the answers

Which of the following materials is likely to have a high resistivity?

<p>Iron (D)</p> Signup and view all the answers

What is the effect of increasing the length of a conductor on its resistance?

<p>It increases (C)</p> Signup and view all the answers

Why do conductors made of certain materials have low resistance?

<p>Due to their low resistivity (C)</p> Signup and view all the answers

What is the relationship between the length and resistance of a conductor?

<p>They are directly proportional (A)</p> Signup and view all the answers

Why do thicker wires have lower resistance?

<p>Due to their larger cross-sectional area (D)</p> Signup and view all the answers

What is the term for the ability of a material to conduct electricity?

<p>Conductivity (A)</p> Signup and view all the answers

What is the effect of increasing the temperature of a conductor on its resistivity?

<p>It increases (A)</p> Signup and view all the answers

Which of the following factors affects the resistance of a conductor the least?

<p>Temperature of the conductor (D)</p> Signup and view all the answers

Why is the formula R = ρL/A used to calculate the resistance of a conductor?

<p>Because it takes into account the resistivity, length, and cross-sectional area (C)</p> Signup and view all the answers

What is the reason for the increased resistance in a longer conductor?

<p>The electrons encounter more collisions as they travel through the conductor. (A)</p> Signup and view all the answers

Which of the following materials is likely to have a high resistance?

<p>Rubber (D)</p> Signup and view all the answers

What happens to the resistance of a conductor when its temperature is decreased?

<p>It decreases (B)</p> Signup and view all the answers

What is the effect of increasing the length of a conductor on its resistivity?

<p>The resistivity remains the same (A)</p> Signup and view all the answers

Why does an incandescent light bulb's filament heat up and emit light?

<p>The filament's resistance is too high (A)</p> Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor on its resistance?

<p>The resistance decreases (B)</p> Signup and view all the answers

Which factor does not affect the resistivity of a conductor?

<p>Color of the conductor (C)</p> Signup and view all the answers

What is the relationship between the length of a conductor and its resistance?

<p>The resistance increases as the length increases (D)</p> Signup and view all the answers

What happens to the resistance of a conductor when it is heated?

<p>It increases (A)</p> Signup and view all the answers

What is the main reason for using a long, thin tungsten wire in an incandescent light bulb's filament?

<p>To increase the resistance (A)</p> Signup and view all the answers

What is the primary reason why thicker conductors have lower resistance?

<p>Thicker conductors have a lower number of collisions between electrons and atoms. (B)</p> Signup and view all the answers

What happens to the resistance of a conductor when its length is doubled and its cross-sectional area is halved?

<p>The resistance increases by a factor of 4. (A)</p> Signup and view all the answers

Why do materials with high resistivity have high resistance?

<p>They have a high density of atoms. (C)</p> Signup and view all the answers

What is the effect of increasing the temperature of a conductor on its resistivity?

<p>The resistivity increases due to increased atomic vibration. (A)</p> Signup and view all the answers

Why do shorter conductors have lower resistance?

<p>They have a lower number of collisions between electrons and atoms. (B)</p> Signup and view all the answers

What is the effect of decreasing the length of a conductor on its resistance?

<p>The resistance decreases due to reduced collisions between electrons and atoms. (C)</p> Signup and view all the answers

What is the relationship between the resistivity of a material and its resistance?

<p>The resistivity of a material is directly proportional to its resistance. (D)</p> Signup and view all the answers

What is the reason for the increased resistance in the filament of an incandescent light bulb as it heats up?

<p>The increased temperature increases the atomic vibration, making it more difficult for electrons to pass through. (B)</p> Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor on its resistivity?

<p>The resistivity decreases due to the reduced number of collisions between electrons and atoms. (C)</p> Signup and view all the answers

Why does the coiled tungsten wire in an incandescent light bulb's filament have high resistance?

<p>The coiled shape increases the length of the wire, increasing the number of collisions between electrons and atoms. (C)</p> Signup and view all the answers

Which of the following factors affects the resistance of a conductor due to the reduction in the number of electrons available for conduction?

<p>Temperature of the conductor (C)</p> Signup and view all the answers

What is the primary reason why a thinner wire has a higher resistance than a thicker wire?

<p>The thinner wire has a lower cross-sectional area (C)</p> Signup and view all the answers

What is the relationship between the resistivity of a material and its ability to conduct electricity?

<p>Lower resistivity means better conductivity (D)</p> Signup and view all the answers

Why do conductors made of copper have a lower resistance than those made of iron?

<p>Copper has a lower resistivity than iron (C)</p> Signup and view all the answers

What is the effect of increasing the length of a conductor on its resistance, assuming the cross-sectional area and material remain constant?

<p>The resistance increases (C)</p> Signup and view all the answers

Which of the following statements is true about the factors that affect the resistance of a conductor?

<p>Both the type of material and length of the conductor affect the resistance (D)</p> Signup and view all the answers

What is the effect of increasing the cross-sectional area of a conductor on its resistance, assuming the length and material remain constant?

<p>The resistance decreases (A)</p> Signup and view all the answers

Which of the following materials is likely to have a high resistance due to its high resistivity?

<p>Tungsten (D)</p> Signup and view all the answers

What is the relationship between the resistivity of a material and its conductivity?

<p>Higher resistivity means lower conductivity (C)</p> Signup and view all the answers

Why do thicker wires have a lower resistance than thinner wires?

<p>Thicker wires have a larger cross-sectional area (A)</p> Signup and view all the answers

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