simplest question ever for a newbie

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the current follows the numbers, with live at 1 until 8 , the filimant of the lamp has a 230 volt drop across it and from 9 to 11 the current is at the neutral voltage and returns to the consumer unit via the blue neutral wire.
 
Doesn't anyone take elementary physics at school anymore?

Maybe giving kids a 4.5V battery, switch, wire and bulb is deemed to be too dangerous :(
 

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