Gr 9 NATURAL SCIENCES: CH 3.3 What is resistance?
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Questions and Answers

What is the relationship between voltage, current, and resistance described by?

  • Ohm's Law (correct)
  • Einstein's Law
  • Newton's Law
  • Faraday's Law

    • What is a material that allows electric charge to flow through it easily?

  • Resistor
  • Insulator
  • Conductor (correct)
  • Inductor

    • What is the purpose of resistors in electrical circuits?

  • To add resistance (correct)
  • To reduce current
  • To eliminate electric charge
  • To increase voltage

    • What symbol represents a resistor in circuit diagrams?

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

    What causes resistance at the microscopic level?

    <p>Electrons colliding with atoms</p> Signup and view all the answers

    What happens to the kinetic energy of electrons when they collide with atoms in a conductor?

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

    Why do devices like cellphone chargers become warm during use?

    <p>Due to resistance</p> Signup and view all the answers

    What is the formula that describes the relationship between voltage, current, and resistance?

    <p>V = IR</p> Signup and view all the answers

    What is the movement of electric charge in a circuit referred to as?

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

    What is the term for electrons that are not associated with a particular atom and can move freely?

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

    What is the unit of measurement for resistance?

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

    What is the purpose of a resistor in an electrical circuit?

    <p>To add resistance to a circuit</p> Signup and view all the answers

    What is the scenario that represents a low resistance environment?

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

    What is the term for a material that allows the flow of electric charge?

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

    What causes the electrons to move towards the positive terminal in a circuit?

    <p>An energy source</p> Signup and view all the answers

    What is the measure of how much a material opposes the flow of electric current?

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

    Which of the following is an example of a low resistance environment?

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

    What kind of electrons are free to move and carry electric current in metals?

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

    What is the purpose of connecting an energy source to a conductor?

    <p>To cause the electrons to move towards the positive terminal</p> Signup and view all the answers

    What is the effect of resistance on the flow of electrons in a circuit?

    <p>It opposes the flow of electrons</p> Signup and view all the answers

    What is the term for a material that allows the flow of electric charge?

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

    What is the unit of measurement for the rate of flow of electric charge?

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

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

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

    What is the purpose of using resistors in electrical circuits?

    <p>To add resistance to the circuit</p> Signup and view all the answers

    What type of material is characterized by having low resistance?

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

    What happens to the electrons in a conductor when they collide with atoms?

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

    Which of the following is an example of a conductor?

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

    What is the effect of increasing the resistance in a circuit?

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

    What is the relationship between the current and resistance in a circuit?

    <p>As current increases, resistance increases</p> Signup and view all the answers

    What happens when electric charge flows through a material with high resistance?

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

    What is the primary reason why devices like cellphone chargers heat up during use?

    <p>Electrons colliding with the atoms of the conductor material</p> Signup and view all the answers

    What happens to the kinetic energy of electrons during collisions with atoms in a conductor?

    <p>It is transferred to the atoms, causing heat</p> Signup and view all the answers

    Why do conductors have some resistance?

    <p>Because electrons collide with the atoms of the conductor material</p> Signup and view all the answers

    What is the main difference between a conductor and a resistor?

    <p>Conductors allow electric charge to flow easily, while resistors do not</p> Signup and view all the answers

    What is the result of decreasing the resistance in a circuit?

    <p>The current in the circuit will increase</p> Signup and view all the answers

    What is the relationship between the voltage and current in a circuit, according to Ohm's Law?

    <p>Voltage is equal to the product of current and resistance</p> Signup and view all the answers

    Why are resistors used in electrical circuits?

    <p>To add resistance to the circuit, controlling the flow of electric charge</p> Signup and view all the answers

    What happens to the flow of electric charge when it encounters a resistor in a circuit?

    <p>It is impeded, but not stopped</p> Signup and view all the answers

    What is the main reason why the movement of electrons is restricted in the corridor and doorway of the school building scenario?

    <p>The conductor's cross-sectional area is reducing</p> Signup and view all the answers

    What is the primary function of an energy source, such as a battery, in an electrical circuit?

    <p>To cause the electrons to move towards the positive terminal</p> Signup and view all the answers

    What is the primary characteristic of a conductor that allows it to facilitate the flow of electric charge?

    <p>The electrons are delocalised and can move freely</p> Signup and view all the answers

    What is the effect of increasing the number of collisions between electrons and atoms in a conductor?

    <p>The flow of electric charge becomes more restricted</p> Signup and view all the answers

    What is the relationship between the resistance of a material and its ability to conduct electric charge?

    <p>A material with high resistance is a poor conductor</p> Signup and view all the answers

    What is the primary reason why a material with high resistance is not suitable for use in electrical circuits?

    <p>It is not a good conductor of electric charge</p> Signup and view all the answers

    What is the main difference between a conductor and a resistor?

    <p>A conductor has low resistance, while a resistor has high resistance</p> Signup and view all the answers

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