In a circuit a cell with internal resistance r is connected to an external resistance R. The condition for the maximum current that drawn from the cell is

Question

In a circuit a cell with internal resistance r is connected to an external resistance R. The condition for the maximum current that drawn from the cell is (A) R=r (B) R < r (C) R > r (D) R=0

Tardigrade Admin · Accepted Answer

The maximum current drawn from the cell will be in the case when the external resistance is minimum.
The current in the circuit will be given by:

I = \frac{E}{R + r}

So, the smallest value of denominator will give maximum current.
Therefore, for maximum current, the value of

R

should be equal to zero.

Q. In a circuit a cell with internal resistance $r$ is connected to an external resistance $R$ . The condition for the maximum current that drawn from the cell is

$R = r$

$R < r$

$R > r$

$R = 0$

Q. In a circuit a cell with internal resistance r is connected to an external resistance R. The condition for the maximum current that drawn from the cell is

R=r

R<r

R>r

R=0

The maximum current drawn from the cell will be in the case when the external resistance is minimum. The current in the circuit will be given by: I=R+rE​ So, the smallest value of denominator will give maximum current. Therefore, for maximum current, the value of R should be equal to zero.

Q. In a circuit a cell with internal resistance $r$ is connected to an external resistance $R$ . The condition for the maximum current that drawn from the cell is

$R = r$

$R < r$

$R > r$

$R = 0$