Current Electricity and Electrical InstrumentMedium
Question
A current of 2 A flows through 2Ω resistor when connected across a batery. The same battery supplies current of 0.5 A when connected acros a 9Ω resistor. The internal resistance of the battery is
Options
A.0.5 Ω
B.1/3 Ω
C.1/4 Ω
D.1 Ω
Solution
Let ε be the emf and r be internal resistance of the batteryIn first case
...... (i)
In second case
...... (ii)
Divide (i) by (ii)
⇒ 4 + 2 r = 4.5 + 0.5 r
1.5 r = 0.5 ⇒ r =
...... (i)In second case
...... (ii)Divide (i) by (ii)
⇒ 4 + 2 r = 4.5 + 0.5 r1.5 r = 0.5 ⇒ r =
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