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

What is an example of a device that uses electromagnets?

<p>Electric bells (B)</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 (B)</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 (D)</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 (C)</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 (B)</p> Signup and view all the answers

What is an example of electroplating in the automotive industry?

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

What is the result of electrolysis of copper chloride solution?

<p>Separation of copper and chlorine (C)</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 (A)</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 (C)</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 (D)</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 (A)</p> Signup and view all the answers

What is an example of an application that uses electrolysis?

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

What is the chemical effect of electric current?

<p>Chemical reaction (D)</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 (A)</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 (B)</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 (B)</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 (D)</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 (C)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

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

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

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

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

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

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

What is the underlying principle behind electrolysis?

<p>Chemical effect of electric current (B)</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 (A)</p> Signup and view all the answers

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

<p>To generate heat (C)</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 (B)</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 (C)</p> Signup and view all the answers

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

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

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

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

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

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

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