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

What is the purpose of a surge protector?

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

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

<p>Power surge (C)</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 (B)</p> Signup and view all the answers

Why is high voltage essential for electricity transmission?

<p>To reduce energy loss due to resistance (B)</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 (D)</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 (D)</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 (A)</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 (A)</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 (D)</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 (B)</p> Signup and view all the answers

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

<p>To support overhead power lines (D)</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 (C)</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 (B)</p> Signup and view all the answers

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

<p>To create steam (C)</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 (C)</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 (B)</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 (C)</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 (A)</p> Signup and view all the answers

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

<p>Increased voltage and decreased current (B)</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 (A)</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 (A)</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 (A)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

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

<p>To regulate voltage levels (B)</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 (A)</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 (A)</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 (A)</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 (B)</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 (A)</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 (D)</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 (B)</p> Signup and view all the answers

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

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

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