Two lamps one rated bow at 220v and the other 40w at 220v are connnected in parallel to the electric supply at 220v.
Draw a circuit diagram to show the connections.
Calculate the current drawn from the electric supply.
Answers
Explanation:
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Explanation:
Given Two lamps one rated 60 w at 220 v and the other 40 w at 220 v are connected in parallel to the electric supply at 220 v.
Draw a circuit diagram to show the connections.
Calculate the current drawn from the electric supply.
We know that
Power P1 = 60 W
Power P2 = 40 W
Also voltage V1 = V2 = 220 V
Power = V^2 / R
So R = V^2 / P
Now resistance R1 = V1^2 / P1
= (220)^2 / 60
= 48400 / 60
= 2420 / 3 ohms
Also resistance R2 = V2^2 / P2
= (220)^2 / 40
= 48400 /40
= 1210 ohms
Now both lamps are in parallel. We know that
1/R = 1/R1 + 1/R2
1/R = 1/2420 / 3 + 1/1210
= 3/2420 + 1/1210
= 3 + 2 / 2420
= 5/2420
= 1/484
So R = 484 ohms
Therefore current I = V/R
= 220 / 484
= 55 / 121
= 5 / 11 A
The current drawn from the electric supply is 5/11 A.
Reference link will be
https://brainly.in/question/1190704
