## What is Ohm’s law?

Ohm’s law states that the voltage across a current carrying conductor is directly proportional to the current flowing through it if all physical conditions and temperature remain constant. Mathematically, it can be expressed as: V= I × R Where V is voltage I is the current R is the resistance offered by the conductor## What is Ohm’s law magic triangle?

It becomes difficult to learn the different relations of V- voltage, I- current, and R- resistance. Hence, there needs to be a solution that helps quickly solve all equations involving V, I, and R. It is the Ohm’s law magic triangle that comes handy while establishing the relations between V, I, and R. If the values of I and R are given, V can be evaluated by multiplying both I and R. If the values of V and I are given, V/I gives the value of R. If the values V and R are provided, I can be evaluated by V/R. Hence, one simple triangle helps students solve any numerical problem related to voltage, current, and resistance. As electrical power can be calculated using Ohm’s law. this triangle can derive the famous power triangle that is mentioned below:## How to verify Ohm’s law:

A simple electrical circuit experiment is required to verify Ohm’s law. Procedure:- A nichrome wire is connected to a circuit with a voltmeter and ammeter.
- After passing a current through the wire, the potential difference and electric current are measured using the voltmeter and ammeter, respectively.
- The ratio of potential difference/ electric current is calculated.
- The current is increased, and the potential difference/ electric current ratio is measured again.
- Note that this ratio will remain equal for both times.
- Hence, Ohm’s law is verified.

## What is the water pipe analogy for Ohm’s law?

Ohm’s law can also be understood using a simple mechanism of water flowing through a pipe. The pipe is analogous to the closed electric circuit. The water flow inside the pipe is similar to the amount of current flowing through the circuit. On increasing the pressure of the water pump, the rate of the water flowing will also increase through the pipe. The same observation is also valid in an electric circuit. On increasing the potential difference, the flow of electrons also increases, increasing the current in the circuit. On measuring the increasing and decreasing voltage and current values, the resistance present will remain constant. Below is the table describing the similar nature of the water pipe and the electric circuit.Water-pipe circuit | Electric circuit |

Increase in Pressure | Increase in Voltage |

Increase of Flow rate | Increase of Current |

Resistance measured is constant | Resistance measured is constant |

## Applications of Ohm’s law:

The major applications of Ohm’s law include:- Ohm’s law can be used to choose a fuse. The current in a fuse is measured with the help of Ohm’s law if you know the resistance.
- Ohm’s law measures the amount of current that can be passed through the electric heater.

## Limitations of Ohm’s law:

Although Ohm’s law is popular in electrical circuits, this law has certain limitations. Some of the main observed limitations of Ohm’s law include:- First, it doesn’t hold good for non-linear electrical devices. The parameters like resistance and capacitance never abide by the linearity of the voltage and current, and hence Ohm’s law does not apply to these electrical elements.
- It does not apply to unilateral networks. These elements allow current to pass in one direction only, and hence Ohm’s law doesn’t hold good for these elements. Examples of such unilateral devices are transistors and diodes.