1. Tardigrade
  2. Question
  3. Physics
  4. A voltmeter is connected in parallel with a variable resistance R which is in series with an ammeter and a cell as shown in the figure. For one value of R, the meters read 0.3 A and 0.9 V. For another value of R the readings are 0.25 A and 1.0 V. What is the internal resistance of the cell?

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Q. A voltmeter is connected in parallel with a variable resistance $R$ which is in series with an ammeter and a cell as shown in the figure. For one value of $R$, the meters read $0.3 \,A$ and $0.9\, V$. For another value of $R$ the readings are $0.25 \,A$ and $1.0\, V$. What is the internal resistance of the cell?

Current Electricity

Solution:

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$r=\frac{10}{5}=2 r$