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AMU Engineering 2018 solved paper Solved Paper
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© examsnet.com
Question : 31
Total: 150
An inverter battery operated on
24
V
and has negligible internal resistance. It is rated at 140 ampere-hour. What external resistance would have to be connected to the battery, if it were to be discharged in 14 hours.
1.6
Ω
2.4
Ω
5.9
Ω
10.0
Ω
Validate
Solution:
V
=
24
V
Q
=
140
ampere-hour
=
140
×
3600
A
−
s
=
1.4
×
3.6
×
10
5
C
=
5.04
×
10
5
C
If
R
be the external resistance, then
R
=
V
I
=
24
(
Q
∕
t
)
=
24
×
t
5.04
×
10
5
∵
t
=
14
hour
=
14
×
3600
s
Hence,
R
=
24
×
14
×
3600
504
×
10
5
=
2.4
Ω
© examsnet.com
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