Ohm's Law (V = IR): is a fundamental formula in an electronics. It is used to calculate the relationship between voltage (V), current (I) and resistance (R) in an electrical circuit.
Ohm's Law states that: "The Current through a conductor between two points is directly proportional to the voltage (Potential difference) across the two points" i.e.
$V ∝ I$
$V = I\,R$ .......... (i)
Where $R$ is a proportionality constant called resistance (R) of the conductor. This equation (i) is the mathematical form of Ohm's Law.
An electric circuit is formed when a conductive path is created to allow free electrons to move continuously. This continuous movement of free electrons through the conductor of a circuit is called a Current (I).
The force motivating electrons to flow in a circuit is called Voltage (V). The voltage is a specific measure of potential energy that is always relative between two points.
Free electrons tends to move through conductors with some degree of friction (or, opposition to motion), called Resistance (R).
The amount of current in a circuit depends on the amount of voltage available to motivate the electrons, and the amount of resistance in the circuit to oppose electron flow (Ohm's Law).
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