Gr 8 Natural Sciences Ch 3.2: Effects of an electric current
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Questions and Answers

What happens to the energy of electrons when they flow through a resistor?

  • The energy is converted into heat (correct)
  • The energy is converted into light
  • The energy is converted into magnetic fields
  • The energy is converted into sound

    • What is the main function of a fuse in an electrical circuit?

  • To protect the circuit from overheating (correct)
  • To improve the efficiency of the circuit
  • To increase the voltage in the circuit
  • To decrease the current in the circuit

    • What is the principle behind the operation of electromagnets?

  • Electric current generates heat
  • Electric current creates a magnetic field (correct)
  • Electric current generates light
  • Electric current generates sound

    • What is the difference between a fuse and a circuit breaker?

    <p>A circuit breaker can be reset, while a fuse cannot be reset</p> Signup and view all the answers

    What is an example of an application that uses the heating effect of electric current?

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

    What is an example of a device that uses electromagnets?

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

    What happens when the current flowing through a fuse is too high?

    <p>The fuse melts and breaks the circuit</p> Signup and view all the answers

    What is the significance of understanding the effects of an electric current?

    <p>It helps us to utilize electricity efficiently and safely</p> Signup and view all the answers

    What is the process of breaking down a liquid or solution into its component elements using an electric current called?

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

    What is the purpose of electroplating a metal object with a thin layer of another metal?

    <p>To improve its appearance, durability, and resistance to corrosion</p> Signup and view all the answers

    What is an example of electroplating in the automotive industry?

    <p>Coating car parts with chromium</p> Signup and view all the answers

    What is the result of electrolysis of copper chloride solution?

    <p>Separation of copper and chlorine</p> Signup and view all the answers

    Why is electroplating used in the jewelry industry?

    <p>To coat inexpensive metals with gold or silver to make jewelry more attractive and affordable</p> Signup and view all the answers

    What is the primary reason for electroplating a metal object with a thin layer of another metal?

    <p>To improve the object's appearance, durability, and resistance to corrosion</p> Signup and view all the answers

    What is the result of electrolysis of a solution?

    <p>The separation of the solution's component elements</p> Signup and view all the answers

    What is the purpose of electroplating car parts with chromium?

    <p>To improve the parts' appearance and prevent corrosion</p> Signup and view all the answers

    What is an example of an application that uses electrolysis?

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

    What is the chemical effect of electric current?

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

    What is the primary reason for using fuses in electrical circuits?

    <p>To prevent overheating and potential fires</p> Signup and view all the answers

    What is the common application of the heating effect of electric current in household appliances?

    <p>Heating of water or air</p> Signup and view all the answers

    What is the main difference between a circuit breaker and a fuse?

    <p>A circuit breaker can be reset after tripping, while a fuse must be replaced</p> Signup and view all the answers

    What is the role of the iron core in an electromagnet?

    <p>To enhance the magnetic field of the electromagnet</p> Signup and view all the answers

    What is the primary application of electromagnets in electric motors and generators?

    <p>To create a magnetic field</p> Signup and view all the answers

    What is the common application of the magnetic effect of electric current in devices?

    <p>Creation of magnetic fields</p> Signup and view all the answers

    What is the primary advantage of using circuit breakers over fuses in modern homes?

    <p>Circuit breakers can be reset after tripping, unlike fuses</p> Signup and view all the answers

    What is the underlying principle behind the heating effect of electric current?

    <p>Electrons transfer their energy to the resistor as heat</p> Signup and view all the answers

    What is the reason behind the durability improvement of electroplated car parts?

    <p>Improved corrosion resistance</p> Signup and view all the answers

    What is the primary application of electrolysis in the jewelry industry?

    <p>Coating inexpensive metals with gold or silver</p> Signup and view all the answers

    What is the resulting product of electrolysis of copper chloride solution?

    <p>Chlorine gas and copper</p> Signup and view all the answers

    What is the primary purpose of electroplating a metal object with chromium?

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

    What is the underlying principle behind electrolysis?

    <p>Chemical effect of electric current</p> Signup and view all the answers

    What is the primary reason for using resistors in electric circuits?

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

    What is the primary function of a heating element in a kettle?

    <p>To generate heat</p> Signup and view all the answers

    What is the primary advantage of using electromagnets over permanent magnets?

    <p>They can be turned on and off</p> Signup and view all the answers

    What is the primary function of a circuit breaker in an electrical circuit?

    <p>To prevent overheating and potential fires</p> Signup and view all the answers

    What is the primary application of the heating effect of electric current in industrial processes?

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

    What is the primary reason for using fuses in electrical circuits?

    <p>To prevent overheating and potential fires</p> Signup and view all the answers

    What is the primary application of the magnetic effect of electric current in electric motors and generators?

    <p>To create a magnetic field</p> Signup and view all the answers

    What is the primary difference between a fuse and a circuit breaker?

    <p>A fuse is not resettable, while a circuit breaker is resettable</p> Signup and view all the answers

    What is the primary advantage of electroplating a metal object with a thin layer of another metal?

    <p>To improve the appearance, durability, and resistance to corrosion of the object</p> Signup and view all the answers

    What is the primary application of electrolysis in the industrial sector?

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

    What is the underlying principle behind electrolysis?

    <p>Breaking down a liquid or solution into its component elements using an electric current</p> Signup and view all the answers

    What is the primary reason for using electrolysis in the production of jewelry?

    <p>To make the jewelry more attractive and affordable</p> Signup and view all the answers

    What is the chemical effect of electric current that is used in electroplating?

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

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