A battery of e.m.f. 3.0 V supplies current through a circuit in which the resistance can be changed. A high resistance voltmeter is connected across the battery. When the current is 1.5 A, the voltmeter reads 2.7 V. Find the internal resistance of the battery.
Answers
Answered by
54
all capital denotions are for external factors while smaller are for internal
V = IR
R = 27/15
EMF = V + v
or , I(R+r) = EMF
or, (3 / 1.5 ) - 9/5 = r
therefore r = 0.2ohm
V = IR
R = 27/15
EMF = V + v
or , I(R+r) = EMF
or, (3 / 1.5 ) - 9/5 = r
therefore r = 0.2ohm
Answered by
47
Use the Formula
V=I x R
R = V/I
R = 2.7 / 1.5
R = 1.8 ohm
i = e. m. f. / R+r
Or,
R+r = e. m. f. / i
1.8 + r = 3.0/ 1.5
1.8 +r = 2
r = 2 - 1.8
r = 0.2 ohm
V=I x R
R = V/I
R = 2.7 / 1.5
R = 1.8 ohm
i = e. m. f. / R+r
Or,
R+r = e. m. f. / i
1.8 + r = 3.0/ 1.5
1.8 +r = 2
r = 2 - 1.8
r = 0.2 ohm
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