The National Grid

• What is the National Grid?

  A system of cables and transformers
• How does the National Grid function?

  It links power stations to consumers
• What is transferred through the National Grid?

  Electrical power
• What is the role of step-up transformers in the National Grid?

  To increase potential difference for transmission
• What do step-down transformers do in the National Grid?

  They decrease potential difference for domestic use
• Why is increasing potential difference important in the National Grid?

  It reduces energy loss during transmission
• What is the effect of lower potential difference in domestic use?

  It provides safer electricity for consumers
• How does the National Grid improve efficiency in energy transmission?

  By using high potential differences and low currents
• What happens to energy loss when using high potential differences?

  Less energy is lost as heat in wires
• Why do lower currents cause less energy loss?

  Because less heat is generated in wires
• What is a consequence of using high potential differences?

  It requires insulation to prevent accidents
• How does the setup of high currents affect energy loss?

  High currents lead to more energy loss
• What is the relationship between potential difference and current in the National Grid?

  Higher potential difference allows lower current
• What is the primary purpose of the National Grid?

  To distribute electrical power efficiently
• How does the National Grid contribute to energy efficiency?

  By minimizing energy loss during transmission
• What is the impact of using high potential differences on energy transmission?

  It enhances efficiency and reduces losses