Ohm’s law was named after the German physicist Georg Simon Ohm, whose treatise published in 1827. Ohms Law is Law states that “Electric current is proportional to voltage and inversely proportional to Resistance”. The basic components of electricity are voltage, current, and resistance. Circuit diagram of ohms Law given below:
Ohm’s Law Formula
Fig: ohm’s law triangle
Each equation shows the relationship between voltage(V), current(I), and resistance(R).
Some Examples of Ohms Law Formula:
if we connect a lamp to circuit run by 8-Volt battery, and resistance is 2 Ohms then the current will be in how much amps?
I = V/R =8/2 = 4 amps.
if you want to make light brighter then we need to increase current. so increase from I=4 amps to I=9 amps, and resistance will remain the same, now calculate Voltage(V)?
V = IR = 9×2 = 18 volts.
I hope you may get understand the Ohms Law Formula by using the formula in examples…
Limitations of Ohm’s law
This law cannot be applied to unilateral networks. A unilateral network has unilateral elements like a diode, transistors, etc…, which do not have the same voltage-current relation for both directions of current. It is also not relevant for non – linear elements.
V-I Characteristics graphs
Applications of Ohm’s Law
- DC power supply
- Alternator Generator
- Electric Iron and Heater