Gr 10 Physical Sciences Ch 13: Resistance
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Questions and Answers

What is the primary cause of resistance in a conductor?

  • Collisions between electrons and atoms (correct)
  • The flow of electric charge
  • The thickness of the conductor's insulation
  • The shape of the conductor

    • What is the unit of measurement for resistance?

  • Watt
  • Ampere
  • Ohm (correct)
  • Volt

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

  • It doubles (correct)
  • It decreases by half
  • It remains the same
  • It quadruples

    • Why do light bulbs have high resistance?

    <p>Due to their thin filaments</p> Signup and view all the answers

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

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

    What is the term for the opposition to the flow of electric charge in a circuit?

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

    Why do wires have lower resistance than light bulbs?

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

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

    <p>Different materials have different intrinsic resistivities</p> Signup and view all the answers

    What determines the resistance of a material?

    <p>Its length and cross-sectional area</p> Signup and view all the answers

    What is the total resistance of resistors connected in series?

    <p>The sum of the individual resistances</p> Signup and view all the answers

    What is the purpose of a resistor in a circuit?

    <p>To control the current flow and voltage in the circuit</p> Signup and view all the answers

    Why do batteries go flat?

    <p>Because all their chemical potential energy is converted into other forms of energy</p> Signup and view all the answers

    What is the primary function of a voltmeter in a circuit?

    <p>To measure the potential difference (voltage) across two points in the circuit</p> Signup and view all the answers

    What is the characteristic of superconductors?

    <p>They have zero resistance at very low temperatures</p> Signup and view all the answers

    What is the purpose of a light bulb in a circuit?

    <p>To emit light when current flows through it</p> Signup and view all the answers

    What is the total resistance of resistors connected in parallel?

    <p>Less than the smallest individual resistance</p> Signup and view all the answers

    What is the purpose of a switch in a circuit?

    <p>To allow the circuit to be opened or closed</p> Signup and view all the answers

    Why do cellphone chargers get warm during use?

    <p>Because the resistors in the charger convert some of the electrical energy into heat</p> Signup and view all the answers

    What is the main reason why a cellphone charger gets warm during use?

    <p>The resistors in the charger convert some of the electrical energy into heat.</p> Signup and view all the answers

    What is the main difference between a series and parallel configuration of resistors?

    <p>The voltage across each resistor is the same in a parallel configuration.</p> Signup and view all the answers

    What is the purpose of a light bulb in a circuit?

    <p>To emit light when current flows through it.</p> Signup and view all the answers

    What is the primary function of an ammeter in a circuit?

    <p>To measure the current flowing through the circuit.</p> Signup and view all the answers

    What happens to the energy stored in a battery as it is used to drive a circuit?

    <p>It is converted into heat and light.</p> Signup and view all the answers

    What is the characteristic of a material that has no resistance at very low temperatures?

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

    What is the purpose of a switch in a circuit?

    <p>To allow the circuit to be opened or closed.</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 of the conductor increases.</p> Signup and view all the answers

    What is the main difference between a voltmeter and an ammeter?

    <p>A voltmeter measures voltage, while an ammeter measures current.</p> Signup and view all the answers

    What happens to the total resistance of a circuit when resistors are connected in parallel?

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

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

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

    Why do collisions between electrons and atoms in a conductor result in heat generation?

    <p>The electrons lose kinetic energy</p> Signup and view all the answers

    What is the main reason why light bulbs have high resistance?

    <p>Due to their thin filaments</p> Signup and view all the answers

    How does the cross-sectional area of a conductor affect its resistance?

    <p>A larger cross-sectional area decreases the resistance</p> Signup and view all the answers

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

    <p>Different materials have different intrinsic resistivities</p> Signup and view all the answers

    What happens when electrons collide with atoms in a conductor?

    <p>They lose kinetic energy and slow down</p> Signup and view all the answers

    What is the purpose of understanding resistance in electrical circuits?

    <p>To design and analyze electrical systems</p> Signup and view all the answers

    What is the result of increasing the cross-sectional area of a conductor?

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

    What is the primary function of a resistor in a circuit?

    <p>To control the voltage and current flow</p> Signup and view all the answers

    What happens to the energy stored in a battery as it is used to drive a circuit?

    <p>It is converted into heat and light</p> Signup and view all the answers

    Why do cellphone chargers contain circuits with resistors?

    <p>To control the current flow and voltage to charge the battery safely</p> Signup and view all the answers

    What is the main difference between a series and parallel configuration of resistors?

    <p>The total resistance is different in both</p> Signup and view all the answers

    What is the primary function of a voltmeter in a circuit?

    <p>To measure the voltage</p> Signup and view all the answers

    What is the characteristic of superconductors?

    <p>They have no resistance at very low temperatures</p> Signup and view all the answers

    What is the purpose of a switch in a circuit?

    <p>To allow the circuit to be opened or closed</p> Signup and view all the answers

    What happens to the total resistance of a circuit when resistors are connected in series?

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

    What is the main reason why batteries go flat?

    <p>Because all the chemical potential energy is used up and converted into other forms of energy</p> Signup and view all the answers

    What is the primary function of an ammeter in a circuit?

    <p>To measure the current</p> Signup and view all the answers

    What is the result of collisions between electrons and atoms in a conductor?

    <p>Electrons lose kinetic energy, which is converted into heat</p> Signup and view all the answers

    Which of the following physical attributes does not affect the resistance of a conductor?

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

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

    <p>It is increased by three times</p> Signup and view all the answers

    Why do cellphone chargers get warm during use?

    <p>Due to the collisions between electrons and atoms in the conductor</p> Signup and view all the answers

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

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

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

    <p>Different materials have different intrinsic resistivities</p> Signup and view all the answers

    What is the purpose of understanding resistance in electrical circuits?

    <p>To design and analyze electrical systems</p> Signup and view all the answers

    What is the result of the flow of electrons in a conductor?

    <p>Heat is generated due to collisions with atoms</p> Signup and view all the answers

    In a series configuration, what happens to the voltage across each resistor?

    <p>The voltage across each resistor is different.</p> Signup and view all the answers

    What is the primary function of a battery in an electric circuit?

    <p>To provide energy to drive the current through the circuit.</p> Signup and view all the answers

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

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

    What is the purpose of using a voltmeter in a circuit?

    <p>To measure the voltage across the circuit.</p> Signup and view all the answers

    Why do superconductors have no resistance at very low temperatures?

    <p>Because the electrons move in a coordinated motion.</p> Signup and view all the answers

    What is the total resistance of three resistors connected in parallel with resistances of 2 ohms, 3 ohms, and 4 ohms?

    <p>1 ohm</p> Signup and view all the answers

    What is the primary function of a light bulb in a circuit?

    <p>To emit light when current flows through it.</p> Signup and view all the answers

    What happens to the current flowing through a circuit when the voltage is increased?

    <p>The current flowing through the circuit increases.</p> Signup and view all the answers

    What is the purpose of using an ammeter in a circuit?

    <p>To measure the current flowing through the circuit.</p> Signup and view all the answers

    What happens to the energy stored in a battery as it is used to drive a circuit?

    <p>The energy stored in the battery decreases.</p> Signup and view all the answers

    What is the primary reason for the generation of heat in a conductor during the flow of electric charge?

    <p>The electrons flowing through the conductor collide with the atoms, causing the electrons to lose kinetic energy.</p> Signup and view all the answers

    Which of the following is a characteristic of a conductor that has a high resistance?

    <p>A thin filament.</p> Signup and view all the answers

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

    <p>The resistance is quadrupled.</p> Signup and view all the answers

    Which of the following materials would have the highest intrinsic resistivity?

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

    What is the primary reason why a light bulb filament is made of a thin material?

    <p>To increase the resistance of the filament and convert electrical energy into heat and light.</p> Signup and view all the answers

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

    <p>The resistance is inversely proportional to the cross-sectional area.</p> Signup and view all the answers

    What happens to the energy of the electrons flowing through a conductor when they collide with the atoms?

    <p>The energy of the electrons is converted into heat and light.</p> Signup and view all the answers

    What is the primary reason why understanding resistance is essential in designing electrical circuits?

    <p>To ensure the efficient transmission of electrical energy.</p> Signup and view all the answers

    What is the primary reason why a light bulb filament has high resistance?

    <p>To convert electrical energy into heat and light</p> Signup and view all the answers

    What is the effect of connecting resistors in parallel on the total resistance?

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

    What is the purpose of a switch in a circuit?

    <p>To control the flow of current through the circuit</p> Signup and view all the answers

    What happens to the energy stored in a battery as it is used to drive a circuit?

    <p>It is converted into other forms of energy</p> Signup and view all the answers

    What is the characteristic of a material that has zero resistance at very low temperatures?

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

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

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

    In a series configuration of resistors, what happens to the voltage drop across each resistor?

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

    What is the primary function of a switch in a circuit?

    <p>To allow the circuit to be opened or closed.</p> Signup and view all the answers

    What happens to the energy stored in a battery as it is used to drive a circuit?

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

    What is the characteristic of a material that has no resistance at very low temperatures?

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

    What is the primary purpose of resistors in a circuit?

    <p>To control the current flow and voltage</p> Signup and view all the answers

    In a series configuration, what is the current through each resistor?

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

    What is the result of using up all the chemical potential energy in a battery?

    <p>The battery goes flat</p> Signup and view all the answers

    What is the primary function of a voltmeter in a circuit?

    <p>To measure the voltage across components</p> Signup and view all the answers

    What is the characteristic of a superconductor?

    <p>It has no resistance at very low temperatures</p> Signup and view all the answers

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

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

    Why do light bulbs emit light and heat?

    <p>Because of the high resistance of the filament</p> Signup and view all the answers

    How does the length of a conductor affect its resistance?

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

    What is the main reason why cellphone chargers get warm during use?

    <p>Because of the collisions between electrons and atoms in the conductor</p> Signup and view all the answers

    What determines the intrinsic resistivity of a material?

    <p>The material itself</p> Signup and view all the answers

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