If different appliances in a domestic are connected in series then if one of the appliance is switched off or stops working then the other appliances will also stop. Moreover, if they are connected in series, then then there will be different voltage for different appliances and there will be loss of voltage due to add on effects of resistances. Each appliance is connected in parallel to each other so that each appliance has an equal potential difference. That’s why series arrangement is not used in domestic circuits and parallel arrangement is used in domestic wiring.
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