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 | SaraNextGen Top Answer
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 |
1 Answer
127 votes
Answer Key / Explanation : (b) -
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
127 votes
Answer Link
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