The wiring in your home is a lot like the circulatory system in your body. It is vital for the functioning of your home, and if something goes wrong, you will have symptoms all over. Unfortunately, some homes have the wiring equivalent to the circulatory system of a 100-year-old, and it is just not built for standing up to the stress that modern life puts it through.
There are some older homes that still have aluminum wiring or knob and tube wiring which are outdated and not very safe, especially if they have been modified by an electrician that isn’t familiar with how they work. It is also possible that your receptacles aren’t properly grounded, which can lead to appliances malfunctioning and creates a risk for electrocution.
If you are looking at an older home, you should make sure that the electrical system is going to be good enough to handle what you throw at it.