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    Hi,
    I've been revising physics and looking over old questions, and one which keeps appearing is 'give three reasons why parallel connections are preferred in domestic wiring'. This is for aqa so their mark schemes can be pretty pernickety and was therefore wondering if anyone knew what the mark scheme said or has said for similar questions, or even just three reasons. Thank you in advance.
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    (Original post by Dave_77)
    Hi,
    I've been revising physics and looking over old questions, and one which keeps appearing is 'give three reasons why parallel connections are preferred in domestic wiring'. This is for aqa so their mark schemes can be pretty pernickety and was therefore wondering if anyone knew what the mark scheme said or has said for similar questions, or even just three reasons. Thank you in advance.
    Don't have any markschemes but 3 valid points should get you the marks.

    it's such an impractical idea it's probably easier to turn this question around and think about what the impact would be if everything in your house HAD to be wired in series... it'd totally change the way you use electricty.

    e.g. You couldn't just turn one light on - to get any electric light you'd have to turn them all on.. along with every other electric appliance in your house.

    think about other things that aren't a problem at the moment.

    you can go out and buy some new appliance and it'll work at the fixed 230V supplied to your house, if it had to be wired in series you'd need an increased supply potential so that everything could have the correct PD.

    you can run thermostatic appliances that switch themselves on and/or off automatically without it having any effect on the rest of your appliances e.g. fridges/freezers, room heaters, water heaters, kettles, electric ovens, toasters.

    what happens to everything else if one appliance fails open-circuit (e.g. oldfashioned tungsten lightbulb filament burning out)?
 
 
 
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