Question

What is Ohm's Law? Give experimental verification of Ohm's Law. pls pls pls ans me urgently!!!

Answer 1

Ohm's law states that at a constant temperature, current 'I' through a conductor between two points is directly proportional to the potential difference or voltage 'V', across the two points. That is, Thus, the ratio V : I is a constant. This constant is called as the resistance (R) of the conductor.

This law can be easily verified by a simple experiment. A length of nichrome resistance wire (or a known value resistor) is connected to a variable DC voltage source through an ammeter. A voltmeter is connected across the resistance wire.

The variable voltage source can be constructed using a potentiometer and a DC power supply.

The variable arm of the POT tap is adjusted to give fixed incremental changes in voltage over a determined voltage range. For each increment the voltmeter and ammeter readings are taken. The readings may be interpreted graphically to determine the resistance value....

Hope it helps.....

Answer 2

$\huge\textbf{Answer :}$



$\huge\textbf{Ohms law :}$



According to it electric current (I) is directly proportional to Voltage (V).

i.e.

$V$ $\alpha$ $I$

If we remove the sign of directly proportional then we have to use a constant i.s. R (Resistance).

i.e.

$V\:=I\:R$

or

$\frac{V}{I}\:=\:R$

or

$\frac{V}{R}\:=\:I$

The S.I. unit of Electric current (I) = Ampere.

The S.I. unit of Voltage (V) = Volts.

The S.I. unit of Resistance is (R) = Ohms.

If we make the V-I graph of Ohms law then it is a $\textbf{straight line.}$

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