electromagnetic induction
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What is a transformer?
Device that can change the voltage of an alternating current.
What are the parts of a transformer?
Primary coil - ac current input Secondary coil - ac current output Iron core
What is ac current vs dc?
AC - alternates direction DC - maintains constant flow of current in one direction
In a national power grid, if the voltage of the electricity passing through a wire is increased… so that…
the current in decreased less energy is wasted as heat and the efficiency is improved
The power station produces electricity at 25KV (25,000V). This is changed to 400KV by transformers before the electricity is sent round the country.
The power station produces energy at … it is changed to…
25,000V/25KV 400KV then reduced again
What does a step up and step down transformer do?
A step-up transformer increases the voltage and decreases the current. A step-down transformer decreases the voltage and increases the current.
What are the advantages and disadvantages of underground cables?
They don’t affect views and are less affected by bad weather. They’re expensive, difficult to bury and difficult to repair as it would disrupt people.
What are advantages and disadvantages of overhead cables?
They’re easier to repair, cheaper, can cross canals/roads easy and are high above the ground. They spoil views, are affected by bad weather and may affect health due to the magnetic fields.