Q. 22

# A battery of emf

10mA

Given,

Emf of the battery, E= 100V

Resistance of series resistor, r= 10kΩ=10000kΩ

Resistance of external resistor, R=0-100Ω

Formula used:

A constant-current source is a power source that supply constant current to an external load, even if there is a change in load resistance.

When the battery is connected to the external resistance that vary from 0 to 100 Ω, the effective resistance will change across the potential difference provided by the battery. Solution:

Let’s find out the current when R=0Ω or when there is no external resistance is connected,

We know that, current i for a series resistor connection is By substituting the known values, we get i as, Now let’s take R as 2 Ω (or a low value like 1 Ω or so)

The value of current, i is Where Rtot is the effective resistance across the battery. From the figure, Rtot can be calculated as, Hence by putting R=2 Ω, we get i as, Similarly, by putting R=100Ω , the highest possible, we get the current i as, So, as the principle predicted, the value of the current, 1mA, does not change much, or it stays consistent till two significant digits.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation view all courses RELATED QUESTIONS :

<span lang="EN-USPhysics - Exemplar

<span lang="EN-USPhysics - Exemplar

Let there be n rePhysics - Exemplar

<span lang="EN-USPhysics - Exemplar

<span lang="EN-USPhysics - Exemplar

Two cells of emf Physics - Exemplar

<span lang="EN-USPhysics - Exemplar

<span lang="EN-USPhysics - Exemplar

Kirchhoff ’s juncPhysics - Exemplar