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

What causes resistance at the microscopic level?

<p>Electrons colliding with atoms (D)</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 (B)</p> Signup and view all the answers

Why do devices like cellphone chargers become warm during use?

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

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

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

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

<p>Electric current (A)</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 (B)</p> Signup and view all the answers

What is the unit of measurement for resistance?

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

What is the scenario that represents a low resistance environment?

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

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

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

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

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

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

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

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

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

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

<p>Delocalised electrons (C)</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 (C)</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 (A)</p> Signup and view all the answers

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

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

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

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

What is the purpose of using resistors in electrical circuits?

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

What type of material is characterized by having low resistance?

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

Which of the following is an example of a conductor?

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

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

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

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

<p>The material heats up (A)</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 (A)</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 (C)</p> Signup and view all the answers

Why do conductors have some resistance?

<p>Because electrons collide with the atoms of the conductor material (D)</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 (B)</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 (B)</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 (B)</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 (A)</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 (D)</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 (A)</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 (B)</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 (C)</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 (C)</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 (B)</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 (C)</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 (D)</p> Signup and view all the answers

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