Last Updated On 01-06-2023 - By Jeesha Sara
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
(a)
60 W
(b)
240 W
(c)
30 W
(d)
120 W
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
(a)
60 W
(b)
240 W
(c)
30 W
(d)
120 W
Question ID - 50314 :-
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be :
(a)
60 W
(b)
240 W
(c)
30 W
(d)
120 W
|
Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be : |
|||
|
(a) |
60 W |
(b) |
240 W |
|
(c) |
30 W |
(d) |
120 W |
In series condition, equivalent resistance is 2R
Thus power consumed is 60W=
In parallel condition, equivalent resistance is R/ 2 thus new power is
P’=
Or P’= 4p = 240 W
Next Question :
|
An object is at a distance of 20m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be : |
|||
|
(a) |
0.92×10−3 m/s away from the lens |
(b) |
2.26×10−3 m/s away from the lens |
|
(c) |
1.16×10−3 m/s towards the lens |
(d) |
3.22×10−3 m/s towards the lens |
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