Nobody wants to be in an emergency situation, so it is important we are armed with facts to help us deal with any problem should it arise.
In an emergency (for example, a leak or an electrical fire), you will want to turn off the electricity immediately. You do this by using the main ON/OFF switch on the consumer unit, fuse box or distribution board.
Make sure you know where your mains switch (or switches) are. Some installations, electric storage heaters for example, might have a separate consumer unit.