Why high voltage is the secret to efficient power grids
In short: Sending electricity across a country sounds simple, but heat loss makes it a massive engineering challenge. This video explains how the National Grid uses specific physics principles to move power from stations to your home with minimal waste.
To minimize energy loss during transmission, the National Grid relies on the relationship P = VI. Because energy is lost as heat, the goal is to keep current low while maintaining the necessary power. This is achieved by using step-up transformers at power stations to significantly increase voltage.
Once electricity reaches its destination, step-down transformers reduce the voltage to a level that is safe for domestic use. The video covers the entire journey, from fluctuating daily demand to the physical infrastructure of pylons that span the country.
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Sources
- Summary by Intellect · source: GCSE Physics - National Grid - How we Generate & Transmit Electricity | Transformers (2027/28 exams)
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