Sum
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Advertisement Remove all ads
Solution
(a) 220 V
(b) Current drawn by the 40 W bulb, `I_1=P/V=40/200=0.18A`
Current drawn by the 60 W bulb, `I_2=P/V=60/200=0.27A`
Total current drawn, `I=I_1+I_2=0.18A+0.27A=0.45A`
(c) Total energy consumed, `E=sum(pxxt)=(40xx1)+(60xx1)=100wh=0.1"kwh""`
Concept: Electric Current
Is there an error in this question or solution?
Advertisement Remove all ads
APPEARS IN
Advertisement Remove all ads
Advertisement Remove all ads
