Ohm's Law plot for simple explanation chain

Ohm's Law for subcircuit - a basic knowledge that we'll get back in school. But often it turns out that we are either forgotten or missed or corny do not understand the law. In this article I will try to explain Ohm's Law for subcircuit in a simple way, by analogy with the plumbing.

Drawing an analogy

So, in order to understand Ohm's law, let's draw an analogy with the hydraulics and represent that:

The voltage U is equal to the water level in the most ordinary water tower;

R = Resistance is outgoing water pipe;

I = current strength of a volume of water flowing through the pipe for a certain time.

current

So, let us now see what is the strength of the current. To this flask was present, which on one side has three holes of the same size, arranged vertically. If this vessel is filled with water, from the side openings start to follow the water.

Moreover, as can be seen from the figure, from the bottom opening of the jet of water will continue to beat everyone, but will be the weakest since the upper stream. Since our opening identical, the resistance to water flow is the same.

During the same time, the lower opening of the water will flow more than the upper (as the column of water «U» exerts different pressures on hole) and volume of water (from the above analogy) flowing out of the hole for a certain time, there is not other than the amperage «I».

Look again carefully at the picture, did not notice a definite pattern here? And it is this: at the same resistance and increases with increasing voltage and current.

Resistance

So, let us now be examined with the following values, namely current. Have you ever seen such things here:

Certainly yes, and so this water tower. Her main purpose in creating pressure in the water-pressure pipes. So, you came home and decided to wash his hands. By opening the tap on full, water flow is significant and navryatli suits you, and you are using the faucet adjust the flow so that it is comfortable for you.

Now think about what was just done? Here's what: changing the resistance to flow, you handle it.

Now transfer this analogy to electricity. Tension remains our constant, since we can not in any way affect our with you water tower, which is constantly maintained the same level of water through the system pumps.

Opening the valve to the maximum, we'll let the flow of water to the full, and turning it to the required level, we we changed the flow resistance. And this has led to the fact that the flow of water has become weak. It turns out that we have adjusted by changing the resistance of the amount of water flowing over a given period of time.

Now, remember, that is the strength of the current. Amperage - a certain number of electrons passing through the cross-section for a certain time.

So, it turns out that by changing the resistance (constant voltage), we are able to change the amperage.

Voltage

Let's consider a simple water supply system where you already have the ability to manage the water tower:

Now create a situation: you need to fill the water container in 1 hour, and the time and is strictly regulated in the upward or downward can not deviate. And then your hose (through which the filled container) comes a man and you just can not get him to go with him.

Upon passing the hose man became resistance and as a result, changed the flow of water. Since you can not remove this resistance is necessary to act in a different way, just a matter of how?

And it's simple. Suffice us to increase the amount of water in the water tower, it will increase the water pressure in the pipes and through our with you peredavlenny hose will flow more water flow. If, by opening the tap on full, filling the tower, you realize that you fill the container in less than an hour, cover up the crane enough. This will reduce the water level in the tower, which consequently reduces the flow through the hose is pinched.

Go back to electricity. So, a person passing the hose, increased resistance and for this reason the current strength we declined. To restore it we'll increase the voltage (water level in the water tower).

Ohm's Law for subcircuit

So, from all of the above you will notice certain patterns? So, G. Ohm, conducting a series of simple experiments to identify these patterns among the three values: current, resistance and voltage and brought the following law:

I hope this article has given you to understand Ohm's Law for subcircuit. Feel free to evaluate the material finger up and thank you for your attention!