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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?

9 years ago

Answers : (1)

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.

 


9 years ago
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