First we would to thank George Simon Ohm for making the Ohm's law!
Georg Simon Ohm (German: 16 March 1789 – 6 July 1854) was a German physicist and mathematician. As a school teacher, Ohm began his research with the new electrochemical cell, invented by Italian scientist Alessandro Volta. Using equipment of his own creation, Ohm found that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current. This relationship is known as Ohm's law.
Ohm’s law states that the voltage v across a resistor is directly proportional to the current i flowing through the resistor.
So we have 3 variables in that description which is Voltage(V) , Current(I) and Resistance(R)
So we have this formula
For Current calculation
For Resistance calculation
Two extreme possible values of R:
An element with R=0 is called short circuit. A short circuit element with resistance approaching zero.
An element with R = ∞ is called open circuit. An open circuit is a circuit element with resistance approaching infinity.
Conductance is the ability of an element to conduct electric current; it is measured in mhos ( ) or siemens (S).
The formula is a Reciprocal of Resistance(R)
Learnings: I learn that we have to assign what loop are we going to use ( If it us clockwise or counter clock wise) and what sign convention ( + or - ) I have to follow. I decided that if enters the positive(+) polarity and leaves the negative (-), I will use the negative polarity. I also learn that Resistance(R) and Conductance(G) are positive quantities, thus Power is always positive. R absorbs power from the circuit ( Passive Element)
Watch this video to know more about Ohm's Law
