The sequence of the sentences has been altered on purpose. A fixed introductory and concluding sentence is given to you for context. You have to re-order the five sentences in the middle. Put the sentences in the correct logical order by answering questions 1 to 5.
Electricity expert, Chris Yelland, explains that power is cut off as a precautionary measure to avoid a catastrophic collapse.
i. If there is an overload and equipment starts to trip, the overall electricity supply decreases, but the demand stays the same.
ii. Yelland says if you had an aerial view of the country, you would see cascading trip-outs spread as a wave of darkness.
iii. This leads to an even greater strain on the parts of the grid that are still on, causing them to overload and trip even more – once again reducing supply.
iv. The first problem is that demand exceeds supply (meaning that the need for electricity is bigger than the electricity that is available).
v. When that happens you immediately have overloading of generators, transformers, cables and switch gear.
iv. The first problem is that demand exceeds supply (meaning that the need for electricity is bigger than the electricity that is available).
i. If there is an overload and equipment starts to trip, the overall electricity supply decreases, but the demand stays the same.
v. When that happens you immediately have overloading of generators, transformers, cables and switch gear.
iii. This leads to an even greater strain on the parts of the grid that are still on, causing them to overload and trip even more – once again reducing supply.
ii. Yelland says if you had an aerial view of the country, you would see cascading trip-outs spread as a wave of darkness.