**the current through a 12v tungsten filament lamp connected to a 12v battery of negligible resistance is 3A. Calculate (i) the resistance of the filament (ii)power of the lamp and (iii) the electrical energy consumed in 5 hrs**

**pls. i need the answer immediatly**

V = 12 Volts

(i) Using Ohm's law :

V = I R, where R is the resistance of the filament.

So, R = V/I = 12/3 = 4 ohms

(ii) Since, P = I

^{2}

^{ }R

So, power of the lamp, P = (3)

^{2}X 4 = 36 Watt

(iii) Electric energy consumed in 5 hours can be calculated by the formula :

E = P X t

given, t = 5 hours = 5 X 3600 = 18000 s

So, E = 36 X 18000 = 648000 joules

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