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

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

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

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

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

    Which factor affects the resistance of a conductor the most?

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

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

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

    Which of the following materials has a low resistance?

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

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

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

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

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

    Why is copper a better conductor than iron?

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

    Why do shorter conductors have lower resistance?

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

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

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

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

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

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

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

    Why do conductors made of certain materials have low resistance?

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

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

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

    Why do thicker wires have lower resistance?

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

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

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

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

    <p>It increases</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</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</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.</p> Signup and view all the answers

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

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

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

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

    Which factor does not affect the resistivity of a conductor?

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

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

    <p>It increases</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</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.</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.</p> Signup and view all the answers

    Why do materials with high resistivity have high resistance?

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

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