Explanation:
Current : Flow of charge per unit time is current. Its unit is ampere. I (Current) = Voltage(V) / Resistance(R)
Resistance : Hindrance to the flow of current is called resistance. Its unit is ohm. R = V/I
Each lamp cause 12 volt drop in voltage so 240/12= 20 lamps will be enough to be connected in series.
Each lamp will light with same brightness because these are connected in series and the current (number of charges passing per unit time) is same through all of these.
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