Ohm's Law
What is Ohm's Law
Ohm’s law is a very fundamental and important law of electric circuits. George Ohm, a German physicist who discovered the law named after him, Ohm’s law.
Before knowing what is Ohm’s law. Let us understand what is current and Voltage.
Current:
- the flow of positive charge from a source to a negative charge source.
- Current is measured by the unit Ampere. It is equal to 1C/s i.e.,
- C-Coulomb and s- second
Voltage
- the driving force of the current, it is the electromotive force that pushes free electrons from one atom to another in the same direction.
- It is also known as potential difference.
- Voltage is measured by the unit Volt(V).
STATEMENT:
It states that the current flowing in a circuit is directly proportional to the voltage applied to it provided when all physical conditions and temperatures remains constant.
FORMULA:
I ∝ V
which means, whenever the current is increase the voltage increases as well.
RELATIONSHIP AMONG VOLTAGE, CURRENT AND RESISTANCE:
The current-voltage relationship is as follows
V = IR (when current & resistance is given)
Here R, the proportionality constant, is called resistance. It opposes the flow of current in the circuit. Resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. The formula can be written in different ways to find Resistance and Current.
Formula to find Current:
I=V/R (when voltage & resistance is given)
From this formula we can conclude that, the current is inversely proportional to the Resistance, i.e.,
I ∝ 1/R
Which means, when the current increases the resistance decreases and vice versa.
Formula to find Resistance:
R=I/V (when current &voltage is given)
APPLICATIONS OF OHMS LAW:
- To determine the voltage, current, or resistance of an electric circuit when the other two quantities are known.
- To maintain the desired voltage drop across the components of electronics.
- To divert current in dc ammeter and other dc shunts.
- To design resistors and circuits.
- To simplify power calculations.
How to memorize Ohm’s Law:
There are a lot of methods to memorize Ohm’s Law, here is one such way to memorize using advanced ACRONYMS method:
It is done by taking out the first letters of every word and making an analogy word out of it, then we try making a sentence of it.
The words should either be funny/weird or something interesting, this will help you visualize the sentence and make it stick to in your mind.
Here we have taken out,
- Voltage(v) = Very
- Current(I) = Important
- Resistor(r) = Rabbit
After making the analogy words out that in a sentence,
In this case you it is,
VERY IMPORTANT RABBIT
