Why aren't series circuts a convenient way to wire a home?

Answer 1

There are two reasons.

Parallel circuits apply the same voltage (the supply voltage) across each branch, which ensures that every appliance in a residence shares the same voltage (their rated voltage) in order to operate at their rated power. With a series circuit, the voltage across each appliance would be less than the supply voltage, and the appliances would not be able to develop their rated power.

The second reason is that, with a series circuit, if one appliances stops working, there will be a break in the circuit, so all the other appliances will stop working too!