The National Grid and Transformers | GCSE Physics Practice
The National Grid is a system of cables and transformers linking power stations to consumers.
Why is electricity transmitted at very high voltages?
What is The National Grid and Transformers | Practice?
"The network of cables and transformers that transfers electrical power from power stations to consumers."
What is the unit of electrical resistance?
Misconception: When a circuit is closed, the 'spent' current returns to the battery.
Calculate the charge flow if a 3A current flows for 10 seconds.
Current is the rate of flow of ____.
Grid Efficiency
Step-up transformers increase PD to 400,000V for efficient long-distance travel.
High PD means low current, which reduces energy loss by heating in cables.
Step-down transformers decrease PD to 230V for safe domestic use.
The system ensures a reliable supply of electricity across the country.
Correction: The National Grid is the CABLES and TRANSFORMERS, not the power stations themselves.
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