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6.4 Ohm's Law

Ohm's Law:


Describes the relationship between Voltage, Resistance, Current i.e., Voltage = (Current) X (Resistance).


It was proposed by George Simon Ohm. Ohm's law states that "The current through a conductor between two points is directly proportional to the voltage across the two points". The law only holds true if the provided temperature and the other physical factors remain constant.  

V= IR

An electrical circuit is a closed loop that connects various electrical elements. We can also analyze the electrical circuits in terms of Voltage, Current and Resistance.

The equation V = IR, can be rearranged to find any one of the three quantities (Voltage, Resistance, Current) given the other two such as:

1. V = IR

2. I = V/R

3. R = V/I

For Example:



In the circuit above Voltage from the battery and Ohm from the resistor has been given. To compute the current flowing through the circuit, the formula is:

I = V/R (or) Current = Voltage / Resistance

I = 10/100 

I = 0.1 Amps


Read the next post: 6.5 Capacitor and Capacitance

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