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Q1. When the null point is acheived, then the current is the current through KLMN and ABRS same?
If yes, then why? if not then why not?

Q2:

PLease tell me why the Current through the resistances will be same in both the cases?

```
6 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
There are many instances where only a portion of an  output voltage from a signal source is needed. If we allowed the full  output voltage from a home CD player to be driven into the input of an  amplifier, the amplifier would play at or near full power at all times.  This would become quite annoying in a very short period of time. To  reduce the overall volume, we need to allow only a fraction of the full  signal through to the amplifier. To control the level of the signal, we  use a potentiometer. A potentiometer (also know as a 'pot') is a  modified resistor. Potentiometers can be used to allow a change in the  resistance in a circuit or as a variable voltage divider (in the case of  a volume control).  If you have a rotary volume control on your TV or  radio, it is (more than likely) a potentiometer being used as a variable  voltage divider.* A potentiometer generally has 3 terminals. 2 of the terminals are  connected to the opposite ends of a resistive element. The 3rd terminal  (usually, is physically in-between the other 2 terminals) is called the  wiper. The wiper is a contact (actually, generally many very small  contacts) that slides along the resistive element. The diagram below  shows the schematic symbol for a pot.

```
6 years ago
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