Are home appliances part of a circuit?

If you mean any domestic home which has appliances connected to a mains electrical supply, each applicance is connected to one "leg" of the supply in parallel with other appliances. For instance a table lamp, a television and a music center might all be plugged into one leg of the supply. They are not connected to it in series, they are connected in parallel. Similarly the ceiling lights for each floor of your house will be connected to the mains supply in parallel.

It is of course possible to connect certain simple things such as light bulbs in series and connect them to the supply. That would then be a small series circuit. If two normal lamps were wired in series each would get only half the supply voltage so they would not glow very brightly.

Some other lights which are usually connected in series are lamps to decorate houses or trees at holiday times. These glow brightly because they each need a low voltage. For instance if your house supply is 120 Volts you could use twenty 6 volt bulbs in series, or forty 3 volt bulbs. Or 80 1.5 volt bulbs!

and then you go BOOM! and die. and then nobody will miss you. and have a party. and so does everybody else.