In electronics there is a large number of units of measurement used to set parameters, one of these is the ohm. This article will analyze the Ohm’s law so that you know in detail what it is for and what is its importance in the circuits.
The first thing you will see are the key principles and the most important concepts that the German physicist Ohm’s law has. This will help you better apply the Law.
By last, you can know the relationship between voltage, amperage and resistance taking into account the atomic structure. Become a true electronics expert.
What is the OHM Law and what is it for in modern electronics?
The Ohm’s law is a physical explanation denoting the behavior of current in a circuit, which is affected by voltage and resistance. In this way it can be understood that the intensity increases when the voltage also increases, without modifying the resistance.
Instead, the current decreases when it increases in proportion to the resistance, taking into account that the voltage has not been modified. These relationships can be expressed in the formula V = IxR; where V is the voltage, I the current capacity in amperes and R the resistance, which is measured in Ohms. By modifying the main formula, it is obtained that the current in amps is equal to the voltage divided by the resistance. And the amps is equal to the volts divided into the Ohms.
This law owes its name to the German physicist Georg simon ohm, which presented his theory after various experiments in 1827 through the article called The galvanic circuit, mathematically analyzed. OHM’s Law is used to determine exactly the capacity that the elements that are included in a bus must contain. In this way you can determine the necessary voltage and what type of resistance must be added so that the circuit is not damaged.
Key principles of the OHM Law What are the most important and determining?
The basic principles of the OHM law are:
- Electronics has three quantities that are related to each other; resistance, current (or amperage), and potential difference, also called voltage.
- Ohm’s law can be applied in all or part of a circuit, without affecting the rest.
- If the voltage is kept constant, the current decreased when resistance increases.
- When the resistance remains unchanged, the intensity of the current will increase when the voltage increases.
- Of the 2 previous statements it follows that resistance prevents electric current and voltage increases it.
- Current voltage graphs they are represented by a straight line which passes through the 0 coordinate point.
- The general formula is V = IR => with V = voltage; I = amps and R = ohms.
What are the most important concepts of the Law of OHM that we must remember?
The most important concepts offered by the OHM law in modern science are:
Current, voltage and resistance
Current is defined as the constant sequence of charge that is transmitted by a conductor, is measured in amps at a given time. Voltage is the electrical current that is distributed from a conductor, depending on the resistance. While the resistance It is the difficulty it offers to the flow of charges that are transmitted in a conductor.
Atomic structure
The electrical charge that objects have depends on their atomic structure, the electron being the basic unit of measurement that has a charge.
Conductive substances
There are substances that behave differently in conducting current due to the movement of their electrons in the atomic structure. From this it follows that there are elements drivers Y no drivers. For example, him copper and the gold, used in current electronic devices are excellent conductors due to the atomic crystalline structure they have.
Drivers according to OHM law
Also called ohmic conductors, are those that comply with the law of the German physicist. Where a constant temperature resistance remains unchanged and does not modify the electric current. In turn they are non-ohmic conductors, which vary its resistance depending directly on the voltage.
Resistant substances
There are elements that are resistant to the movement of electric charge, which are called insulators. This is due to the atomic crystalline structure that wood and certain plastics have, for example.