Ohms Law Formula

Ohm’s Law Formula

In an electrical circuit, current (I), voltage (V), and resistance (R) all have a relationship that is established by the formula known as Ohm’s Law. Georg Simon Ohm created Ohm’s law in 1826 through an experiment. He noticed that, if the temperature stays constant, a circuit’s voltage and resistance are directly proportional to the current passing through it.

According to Ohms Law Formula, assuming all physical parameters, particularly temperature, are constant, the potential difference at the ends of a conductor is directly proportional to the current flowing through it.

When any two values of voltage, current, or resistance are known, the formula for Ohm’s Law, Voltage (V) = Current (I) Resistance (R), aids in determining the value of the third variable that is lacking.

Calculating a component’s power, current, efficiency, voltage, and resistance is one of the most fundamental electrical laws. Ohm’s law is applied in everyday life in electrical fuses that control current to protect circuits, or in fans that control speed by altering resistance.

Formula of Ohm’s Law

Ohms Law Formula is expressed in scalar form, since both current and potential differences are scalar quantities. The three fundamental elements of Ohm’s law are current, voltage, and resistance.

A positive source of charge moves its energy in the direction of a negative source to create current (I). The electromotive force that moves free electrons from one atom to another in the same direction is called voltage, also known as the potential difference (V).

The measurement of the resistance to current flow is called resistance (R). Resistance, abbreviated R, is the proportionality constant. The sign in Ohms denotes it. Ohmic conductors that adhere to Ohm’s law have a constant resistance or R.

V = I x R

Ohm’s Law Solved Examples

Example 1: If the resistance of an electric iron is 70 Ω and a current of 2.1 A flows through the resistance. Calculate the voltage between two points.

Solution: If we are asked to calculate the value of voltage with the value of current and resistance, then cover V in the triangle. Now, we are left with I and R or more precisely I × R.

Therefore, we use the following formula to calculate the value of V:

V = I × R

Substituting the values in the equation, we get

V = 2.1 A × 70 Ω = 147 V

Physics Related Formulas
Resonant Frequency Formula Wave Energy Formula
Temperature Formula Friction Loss Formula
Tangential Acceleration Formula Sound Pressure Level Formula
Spring Constant Formula Power Factor Formula For Single Phase
Angular Displacement Formula Rotational Inertia Formula
Flow Rate Formula Heat Of Vaporization Formula
Instantaneous Velocity Formula Magnetic Declination Formula
Kinematics Formulas Radiant Energy Formula
Kelvin To Celsius Formula Work Done By Gravity Formula
Moment Formula Universal Gravitation Formula

FAQs (Frequently Asked Questions)

1. What is called Ohm's law?

Ohm’s Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

2. What is the SI unit of resistivity?

The SI unit of Resistivity is ohm m.

3. What is the unit of resistance?

The SI unit of resistance is Ohm(Ω)