Two lamps one rated 100 W at 220 V and other 40 W at 220 V are connected parallel to 220 V mains supply. Calculate the current drawn from the supply line
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Answer:
Power of 1st lamp = 100W
Voltage of 1st lamp = 220V
By applying, P = V^2/R
R = V^2/P
= 48400/100
= 484ohm.
Power of 2nd lamp = 40W
Voltage of 2nd lamp = 220V
By applying, P = V^2/R
R = V^2/P
= 48400/40
= 1210ohm.
We know that they are connected in parallel
Req = 1/R1+1/R2
= 1/484+1/1210
= 345.71ohm.
By applying, V = IR
I = V/R
= 220/345.71
= 0.636371Amp.
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