The National Grid and transformers
How electricity gets from a power station to your home, why the cables run at hundreds of kilovolts, and the transformer equation.
You will be able to
- Put the parts of the National Grid in order
- Explain why a high p.d. makes the grid efficient, using P = VI and P = I²R
- Calculate the power wasted in cables
- Use Vp × Ip = Vs × Is (Physics only, Higher)
25 minutes, 8 exam-style questions, with the Ohm's Law and Circuits Calculator.