Ohm’s Law in Electronics: A Practical Guide with Calculations
Ohm’s Law, named after the German scientist Georg Simon Ohm, stands as the foundational principle governing the relationship between Voltage (V), Current (I), and Resistance (R) in electronic circuits. This fundamental law asserts that the electric current (I) is directly proportional to the voltage (V) and inversely proportional to the resistance (R) within any circuit.
Ohm’s Law:
The simplicity of Ohm’s Law Calculator makes it a cornerstone concept from which all other electrical principles are derived. It is often the first law introduced to those venturing into the field of electronics. Essentially, it states that the voltage across any two points in a circuit equals the product of the resistance between those points and the current flowing through the circuit. Mathematically, this is expressed as V = IR, where V represents Voltage, I represents Current, and R represents Resistance.
Formula:
The formula can be rearranged into three equivalent expressions:
V = IR
I = V/R
R = V/I
These formulas empower engineers and enthusiasts to calculate voltage, current, or resistance in a given circuit. Additionally, understanding either of these parameters allows for the determination of power using formulas such as P = VI, P = I²R, and P = V²/R.
Ohm’s Law Principle:
To illustrate Ohm’s Law in action, consider two circuits with a common 12V.
voltage source but different resistance values (110Ω and 220Ω). Calculating the current (I) in each circuit using the formula I = V/R reveals that for the 110Ω circuit, I is approximately 0.11A, and for the 220Ω circuit, I is around 0.5A. These values align with measurements obtained using an ammeter.
Ohm’s Law calculations extend beyond the determination of current. By inputting known values into the formulas, one can calculate resistance with known voltage and current or voltage with known current and resistance. This calculative approach also provides the power rating of the circuit.
You can Check out this link for practical applications of Ohm’s law — https://circuitdigest.com/calculators/ohms-law-calculator
