Question

what is a ohm law? with explain​

Answer 1

Answer:

In 1828, George Simon Ohm, a German physicist, derived a relationship between electric current and potential difference. This relationship is known as Ohm’s law. Certain formulas in Physics are so prevalent that they become popular knowledge that you end up memorising without trying. In the field of Modern Physics, it is E=m⋅c2. Similarly, in the field of current electricity, it is the Ohm’s law about which we will be studying in this article.

What is Ohm’s Law?

Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged. Mathematically it can be represented as,

Potential difference ∝ Current

V ∝ I  

( When the value of V increases the value of I increases simultaneously)

V = IR

Where,

V is Voltage in volts (V)

R is Resistance in ohm (Ω)

I is Current in Ampere (A)

Ohm’s Law Formula

As an equation, the Ohm’s Law serves as an algebraic recipe for calculating the current when the resistance and the potential difference are known. Likewise, if any two parameters in the equation are known, then the unknown third parameter can be easily calculated.

Ohm’s Law Application

The main applications of Ohm’s law are:

To determine the voltage, resistance or current of an electric circuit.

Ohm’s law is used to maintain the desired voltage drop across the electronic components.

Ohm’s law is also used in dc ammeter and other dc shunts to divert the current.

Ohm’s Law Limitation

Following are the limitations of Ohm’s law:

Ohm’s law is not applicable for unilateral electrical elements like diodes and transistors as they allow the current to flow through in one direction only.

For non-linear electrical elements with parameters like capacitance, resistance etc the voltage and current won’t be constant with respect to time making it difficult to use Ohm’s law.

Explanation:

Answer 2

Ohm's Law :

Ohm's law states that the current (I) passing through a conductor is directly proportional to the potential difference (V) across its ends, provided the physical conditions like temperature, density, etc. remains unchanged.

Mathematically :

Potential difference ∝ Current

or

Potential difference = Resistance × Current

or

V ∝ I

or

V = RI

Here, Resistance (R) is a constant.⠀ ⠀⠀ ⠀ ⠀⠀ ⠀

@ItsFadedStar booster :

Resistance : It is a property of conductor by virtue of which it opposes the flow of current through it. It is equal to the ratio of the potential difference applied across its ends and the current flowing through it

$\sf Resistance = \dfrac{Potential \: difference}{Current}$

or

$\sf R = \dfrac{V}{I}$