This equipment can turn on or function if there is an electric current originating from the voltage connected to the equipment itself. So it will produce a potential difference.
Ohm’s law is one of the basic sciences of electronics. This knowledge is very useful to help us calculate the current, voltage or resistance of an electrical circuit. Where ohm’s law states the relationship between mathematics and current, voltage, and also network resistance.
The name of this law is taken from a German physicist and mathematician named Georg Simon Ohm. Ohm was the first person to research the relationship between electric current strength and potential difference in a conductor.
In this research, Ohm discovered a mathematical relationship between electric current strength and potential difference, which eventually became known as Ohm’s Law.
It is known that the greater the potential difference that appears, the greater the current flowing. The magnitude of the ratio between potential difference and electric current strength is always the same or constant.
So the potential difference is equivalent to the current strength (V ~ I). If seen mathematically, it can be written that V = m x l, m is the constant ratio between potential difference and current strength.
One formula that describes Ohm’s Law reads, “The current flowing in a conductor is proportional to the potential difference between the ends of the conductor provided the temperature remains constant.
In everyday life, sometimes we will find an electrical device that says 220 V/2 A. This writing was not written without a purpose. The purpose of this article is to inform that the electrical device will work optimally and for a long time if it is installed with a voltage of 220 V and a current strength of 2 A. Then, what if it is installed at a higher or lower voltage? For example, there are two lamps that say 220 V/2 A, each installed at 440 V and 55 V. So what will happen?
For lamps that are installed at a higher voltage, this will result in the lamp shining brighter but not lasting as long. Meanwhile, for lights that are installed at a lower current voltage, this will result in the lights becoming dimmer. Therefore, you must always pay attention to the instructions when using electrical tools.
What is Ohm’s Law
According to Wikipedia, Ohm’s Law is that electric current is proportional to voltage and inversely proportional to resistance. Meanwhile, according to the Collins Dictionary, Ohm’s Law is the principle of electric current flowing through a conductor which is proportional to the potential difference. However, the temperature remains constant. The proportional constant is the resistance of the conductor.
The Ohm’s Law equation and Ohm’s Law formula describe how current flows through any material when a voltage is applied. One thing you need to remember is the difference between low resistance and high resistance. An electrical cable or other conductor has low resistance, which means that current will flow easily. Conversely, if the resistance is high, it will be difficult for current to flow.
The understanding of Ohm’s Law above will not help much if we don’t know what variables we are using, what their equations are, and how to use them. Based on the American English Dictionary, Ohm’s Law has a ratio that is proportional to the current in a dc circuit given a voltage and is inversely proportional to resistance. Not only dc, Ohm’s Law also applies to ac circuits.
Ohm’s Law is usually depicted as a graph of the linear relationship between voltage (V) and current (I) in an electrical circuit. We can imagine what Ohm’s Law looks like with an illustration of a pipe.
- The water pipe represents the resistance (R) in the circuit, calculated in Ohms (Ω).
b. Water is an electric current (I) that flows in a circuit, calculated in amperes (A).c. The difference in height between the waters is the voltage (V) in the circuit, calculated in volts (V).
From the explanation above, the illustration looks like this:
- If the water pipe is narrow or has high resistance, this will limit the water or electric current flowing in the circuit.
b. If the water pipe is wide or has low resistance, this will increase the water or electric current flowing in the circuit.
Ohm’s Law second
Initially, Ohm’s Law consisted of two parts. The first part is the definition of resistance, namely V = IR. This relationship is often named Ohm’s Law. However, Ohm also said that R is a constant that does not depend on V or I. The relationship V = IR can be applied to any resistor, where V is the potential difference between the two ends of the resistance and I is the current flowing in it. While R is the resistance or resistance of the resistor.
Ohm’s Law itself states, “The strength of the current flowing in a conductor or resistance is proportional to the potential difference or voltage between the ends of the conductor. This statement can be written as follows, namely I ∞ V.”
In everyday life, current strength is needed like electric current strength. For example, if you connect a wire to a 6 V battery, the current flow will be twice as high as if it was connected to a 3 V battery.
From here, for example, let’s take the example of electric current with the flow of water in a pipe or river which is influenced by gravity. If the pipe and river are almost flat, the water speed will be relatively small.
However, if one end is higher than the other, the flow speed or current will be greater. The greater the difference in height, the greater the current. That said, the amount of current flow in the wire does not only depend on the voltage. But it also depends on the resistance provided by the wire to the flow of electrons.
Pipe walls or river banks, as well as rocks in the middle, can provide obstacles to current flow. In the same way, electrons will be slowed down due to interactions with the wire atoms. The higher the resistance, the smaller the current in a voltage V. So the current will be inversely proportional to the resistance.