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Byju's Answer
Standard X
Physics
Electric Motor
Find the effi...
Question
Find the efficiency of the below given battery having internal resistance
6
Ω
.
A
75
%
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B
37.5
%
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C
50
%
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D
67
%
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Solution
The correct option is
D
67
%
Current in the circuit,
i
=
10
6
+
12
=
5
9
A
Now, power input,
P
i
n
=
E
i
=
10
×
5
9
=
50
9
W
and power output,
P
o
u
t
=
i
2
R
=
25
81
×
12
W
Efficiency of the cell,
=
P
i
n
P
o
u
t
×
100
≈
67
%
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