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A d.c. main supply of e.m.f 220 v is connected across a storage battery of e.m.f 200 v through a resistance of 1ohm .the battery terminals are connected to an external resistance R. The minimum value of R so that a current passes through the battery to charge it is ??
a) 7 ohm
b) 9 ohm
c) 11 ohm
d) zero
answer with proper explaination.....
spammers stay away
A d.c. main supply of e.m.f 220 v is connected across a storage battery of e.m.f 200 v through a resistance of 1ohm .the battery terminals are connected to an external resistance R. The minimum value of R so that a current passes through the battery to charge it is ??
a) 7 ohm
b) 9 ohm
c) 11 ohm
d) zero
answer with proper explaination.....
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Hey dear,
◆ Answer-
R = 11 ohm
◆ Explaination-
# Given-
r = 1 ohm
E = 200 V
V = 220 V
# Solution-
Let R be minimum value of resistance required.
Resistance of battery is calculated by-
r = R (V-E) / V
R = rV / (V-E)
R = 1 × 220 / (220-200)
R = 220/20
R = 11 ohm
Therefore, minimum value of resistance required so that current passes through battery to charge it is 11 ohm.
Hope it helps...