Question

Question No 22

Derive the equation for Ohm 'slaw????

I expect answer only from Stars and Moderators only.

Answer 1

$\textbf{Answer :}$

$\huge\textbf{Ohms law :}$

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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Answer 2

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. Thus, the ratio V: I is constant, and is called the resistance, R, of the conductor. In other words, V/I = constant = R, or V = IR, where R is a constant for the given metallic wire at a given temperature and is called its resistance.