Define and apply current Define and apply resistance 1. A number of identical lamps are each mark 12V, 2.0 W. The lamps are connected in series to a 240 V mains supply and each lamp lights with normal brightness. (a) Calculate (i) the number of lamps connected in series,

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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