Two lamps, one rated 60w at 220V and the other 40W at 220V, are connected in parallel to the electric supply at 220V. a) Calculate the current drawn from the electric supply. b) Calculate the total energy consumed by the two lamps together when they operate for one hour.
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a)
R= V²/P
R1 = 4840/6 Ω
R2 = 4840/4 Ω
therefore equivalent resistance by parallel formula would be 484Ω
I = V/R
I = 220/484 = 0.45 A
b)
Energy = Pt = VIt = 220*0.45*1 = 99J
R= V²/P
R1 = 4840/6 Ω
R2 = 4840/4 Ω
therefore equivalent resistance by parallel formula would be 484Ω
I = V/R
I = 220/484 = 0.45 A
b)
Energy = Pt = VIt = 220*0.45*1 = 99J
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