13.3 The National Grid

• What is the primary purpose of the National Grid?

  Transmit electricity
• Step-up transformers increase voltage for efficient transmission.


  True
• Order the voltage levels in the National Grid from highest to lowest.

  1️⃣ High voltage

  2️⃣ Medium voltage

  3️⃣ Low voltage
• High voltage minimizes energy loss during long-distance transmission
• Step-up transformers increase voltage for efficient transmission.

  True
• Why is high voltage used for long-distance electricity transmission?

  Minimizes energy loss
• What is the primary function of step-down transformers?

  Reduce voltage
• What are the two types of transformers in the National Grid?

  Step-up and step-down
• Why is high voltage preferred for long-distance electricity transmission?

  Low energy loss
• Where is electricity generated in the National Grid?

  Power stations
• High voltage reduces energy loss during long-distance travel
• Match the components of the National Grid with their functions:

  Power Stations ↔️ Generate electricity

  Step-up Transformers ↔️ Increase voltage

  Step-down Transformers ↔️ Reduce voltage

  Transmission Lines ↔️ Carry electricity
• Power stations generate electricity at medium voltage.
• Match the component with its function:

  Power Stations ↔️ Generate electricity

  Step-up Transformers ↔️ Increase voltage for transmission

  Transmission Lines ↔️ Carry electricity over long distances

  Step-down Transformers ↔️ Reduce voltage for distribution
• Step-up transformers increase voltage for efficient transmission.


  True
• Step-up transformers reduce energy loss by minimizing current and heat.


  True
• Transformers transform voltage levels to ensure minimal energy loss.
• What is the purpose of earthing in the National Grid?

  Direct fault currents safely
• The National Grid ensures a reliable and efficient electricity supply
• What type of voltage do step-down transformers produce?

  Low
• High voltage is used in the National Grid to reduce energy loss.


  True
• What is the purpose of the National Grid?

  Transmit electricity
• Steps of electricity transmission in the National Grid

  1️⃣ Power stations generate electricity

  2️⃣ Step-up transformers increase voltage

  3️⃣ Transmission lines carry electricity

  4️⃣ Step-down transformers reduce voltage

  5️⃣ Electricity is distributed to homes
• The National Grid ensures a reliable and efficient electricity supply.
• High voltage minimizes energy loss during transmission.
• Match the type of transformer with its function:

  Step-up Transformers ↔️ Increase voltage for transmission

  Step-down Transformers ↔️ Decrease voltage for distribution
• Insulation in high-voltage cables prevents electric shocks.


  True