Gr 9 NATURAL SCIENCES: CH 3.6 National electricity grid
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Questions and Answers

What is the purpose of burning coal in a power plant?

  • To generate steam
  • To produce heat (correct)
  • To produce electricity directly
  • To heat water

    • What happens to the steam in a power plant?

  • It turns a turbine (correct)
  • It is used to heat homes
  • It is converted into electricity
  • It is transmitted through power lines

    • What is the purpose of a step-up transformer?

  • To monitor voltage levels in the grid
  • To decrease voltage before transmission
  • To increase voltage before transmission (correct)
  • To distribute electricity to homes

    • What is a common cause of power surges?

    <p>Lightning strikes and faulty wiring</p> Signup and view all the answers

    What is the purpose of a surge protector?

    <p>To absorb excess voltage and safeguard appliances</p> Signup and view all the answers

    What happens to the voltage and current in a step-down transformer?

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

    Why are transformers crucial in managing voltage levels throughout the grid?

    <p>They enable efficient transmission and safe distribution of electricity</p> Signup and view all the answers

    What is the final step in the process of generating and distributing electricity?

    <p>Electricity is distributed to homes and businesses</p> Signup and view all the answers

    What is the primary purpose of a transformer in the national electricity grid?

    <p>To increase or decrease the voltage of an electric current</p> Signup and view all the answers

    What type of power lines are used to transport electricity over long distances?

    <p>High-voltage power lines</p> Signup and view all the answers

    What is the term for a sudden increase in voltage within an electrical circuit?

    <p>Power surge</p> Signup and view all the answers

    What is the main function of pylons in the national electricity grid?

    <p>To support overhead power lines</p> Signup and view all the answers

    Why is high voltage essential for electricity transmission?

    <p>To reduce energy loss due to resistance</p> Signup and view all the answers

    What is the purpose of step-up transformers in the national electricity grid?

    <p>To increase the voltage at the power station for transmission</p> Signup and view all the answers

    What is the national electricity grid?

    <p>A network of interacting components that provide electricity across a country</p> Signup and view all the answers

    What is the primary function of transmission lines in the national electricity grid?

    <p>To transport electricity over long distances</p> Signup and view all the answers

    What is the main purpose of power stations in the national electricity grid?

    <p>To generate electricity from various sources</p> Signup and view all the answers

    What is the role of step-down transformers in the national electricity grid?

    <p>To decrease the voltage of an electric current</p> Signup and view all the answers

    What is the primary component of the national electricity grid that ensures the delivery of electricity to consumers?

    <p>Transmission lines</p> Signup and view all the answers

    What is the purpose of pylons in the national electricity grid?

    <p>To support overhead power lines</p> Signup and view all the answers

    What is the main benefit of using high-voltage electricity for transmission?

    <p>To reduce energy loss due to resistance</p> Signup and view all the answers

    What is the primary function of the national electricity grid?

    <p>To ensure the delivery of electricity from power stations to consumers</p> Signup and view all the answers

    What is the primary purpose of heating water in a power plant?

    <p>To create steam</p> Signup and view all the answers

    What would happen to electronic devices during a power surge?

    <p>They could be damaged by the sudden spike in voltage</p> Signup and view all the answers

    What is the main benefit of using high-voltage transmission lines?

    <p>Reducing energy loss due to resistance</p> Signup and view all the answers

    What is the function of grid monitoring in relation to power surges?

    <p>To detect power surges and cut off the power supply</p> Signup and view all the answers

    What is the purpose of transformers in the electricity grid?

    <p>To manage voltage levels throughout the grid</p> Signup and view all the answers

    What is the outcome of using step-up transformers before transmission?

    <p>Increased voltage and decreased current</p> Signup and view all the answers

    What would be the effect of not using step-down transformers before distribution?

    <p>Electricity would be distributed at a higher voltage</p> Signup and view all the answers

    What is the role of a turbine in a power plant?

    <p>To power a generator and produce electricity</p> Signup and view all the answers

    What is the primary reason for generating high-voltage electricity in power stations?

    <p>To minimize energy loss during transmission</p> Signup and view all the answers

    What is the main function of pylons in the national electricity grid?

    <p>To support overhead power lines</p> Signup and view all the answers

    What happens to the voltage of the electric current when it reaches residential and commercial areas?

    <p>It decreases to a safe level</p> Signup and view all the answers

    What is the primary benefit of using high-voltage transmission lines?

    <p>To minimize energy loss during transmission</p> Signup and view all the answers

    What is the purpose of using transformers in the national electricity grid?

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

    What is the outcome of not using step-down transformers before distribution?

    <p>The electricity would be unsafe for use</p> Signup and view all the answers

    What is the primary function of the transmission lines in the national electricity grid?

    <p>To transport electricity over long distances</p> Signup and view all the answers

    What is the primary reason for using high-voltage transmission lines in the national electricity grid?

    <p>To reduce energy loss due to resistance in transmission lines</p> Signup and view all the answers

    What would be the outcome if step-up transformers were not used before transmission?

    <p>Increased energy loss due to resistance in transmission lines</p> Signup and view all the answers

    What is the primary purpose of grid monitoring in relation to power surges?

    <p>To monitor voltage levels and detect power surges</p> Signup and view all the answers

    What would happen to sensitive electronic devices during a power surge if surge protectors were not used?

    <p>They could be damaged or destroyed</p> Signup and view all the answers

    What is the primary role of transformers in the national electricity grid?

    <p>To manage voltage levels throughout the grid</p> Signup and view all the answers

    What is the outcome of using step-down transformers before distribution?

    <p>Decreased voltage and increased current</p> Signup and view all the answers

    What is the primary cause of power surges in the national electricity grid?

    <p>Lightning strikes and faulty wiring</p> Signup and view all the answers

    What is the outcome of not using surge protectors in households?

    <p>Sensitive electronic devices could be damaged or destroyed</p> Signup and view all the answers

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